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Mu (/ˈm(j)uː/;^[1]^[2] uppercase Μ, lowercase μ; Ancient Greek μῦ [mŷː], Greek: μι or μυ—both [mi]) is the twelfth letter of the Greek alphabet, representing the voiced bilabial nasal IPA: [m]. In the system of Greek numerals it has a value of 40.^[3] Mu was derived from the Egyptian hieroglyphic symbol for water, which had been simplified by the Phoenicians and named after their word for water, to become 𐤌^img (mem). Letters that derive from mu include the Roman M and the Cyrillic М, though the lowercase resembles a small Latin U (u).

Names

Ancient Greek

In Greek, the name of the letter was written μῦ and pronounced [mŷː].

Modern Greek

In Modern Greek, the letter is spelled μι and pronounced [mi]. In polytonic orthography, it is written with an acute accent: μί.^[4]^[5]

Use as symbol

The lowercase letter mu (μ) is used as a special symbol in many academic fields. Uppercase mu is not used, because it appears identical to Latin M.

Prefix for units of measurement

"μ" is used as a unit prefix denoting a factor of 10⁻⁶ (one millionth), in this context, the symbol's name is "micro".

Metric prefix
International System of Units prefix, also known as "SI prefix"
The micrometre with a symbol of "μm" can also be referred to as the non-SI term "micron".

Mathematics

"μ" is conventionally used to denote certain things; however, any Greek letter or other symbol may be used freely as a variable name.

a measure in measure theory
minimalization in computability theory and Recursion theory
the integrating factor in ordinary differential equations
the degree of membership in a fuzzy set
the Möbius function in number theory
the population mean or expected value in probability and statistics
the Ramanujan–Soldner constant

Physics and engineering

In classical physics and engineering:

the coefficient of friction (also used in aviation as braking coefficient (see Braking action))
reduced mass in the two-body problem
Standard gravitational parameter in celestial mechanics
linear density, or mass per unit length, in strings and other one-dimensional objects
permeability in electromagnetism
the magnetic dipole moment of a current-carrying coil
dynamic viscosity in fluid mechanics
the amplification factor or voltage gain of a triode vacuum tube^[6]
the electrical mobility of a charged particle
the rotor advance ratio, the ratio of aircraft airspeed to rotor-tip speed in rotorcraft^[7]^[8]
the pore water pressure in saturated soil

In particle physics:

the elementary particles called the muon and antimuon
the proton-to-electron mass ratio

In thermodynamics:

the chemical potential of a system or component of a system

Computer science

In evolutionary algorithms:

μ, population size from which in each generation λ offspring will generate (the terms μ and λ originate from evolution strategy notation)

In type theory:

Used to introduce a recursive data type. For example, ${\text{list}}(\tau )=\mu {}\alpha {}.1+\tau {}\alpha$ is the type of lists with elements of type $\tau$ (a type variable): a sum of unit, representing nil, with a pair of a $\tau$ and another ${\text{list}}(\tau )$ (represented by $\alpha$ ). In this notation, $\mu$ is a binding form, where the variable ( $\alpha$ ) introduced by $\mu$ is bound within the following term ( $1+\tau {}\alpha$ ) to the term itself. Via substitution and arithmetic, the type expands to $1+\tau +\tau ^{2}+\tau ^{3}+\cdots$ , an infinite sum of ever-increasing products of $\tau$ (that is, a $\tau {}{\text{ list}}$ is any $k$ -tuple of values of type $\tau$ for any $k\geq 0$ ). Another way to express the same type is ${\text{list}}(\tau )=1+\tau {}{\text{list}}(\tau )$ .

Chemistry

In chemistry:

the prefix given in IUPAC nomenclature for a bridging ligand

Biology

In biology:

the mutation rate in population genetics
A class of Immunoglobulin heavy chain that defines IgM type Antibodies

Pharmacology

In pharmacology:

an important opiate receptor

Orbital mechanics

In orbital mechanics:

Standard gravitational parameter of a celestial body, the product of the gravitational constant G and the mass M
planetary discriminant, represents an experimental measure of the actual degree of cleanliness of the orbital zone, a criterion for defining a planet. The value of μ is calculated by dividing the mass of the candidate body by the total mass of the other objects that share its orbital zone.

Music

Mu chord
Electronic musician Mike Paradinas runs the label Planet Mu which utilizes the letter as its logo, and releases music under the pseudonym μ-Ziq, pronounced "music"
Used as the name of the school idol group μ's, pronounced "muse", consisting of nine singing idols in the anime Love Live! School Idol Project
Official fandom name of Kpop group f(x), appearing as either MeU or 'μ'
Hip-hop artist Muonboy has taken inspiration from the particle for his stage name and his first EP named Mu uses the letter as its title.

Cameras

The Olympus Corporation manufactures a series of digital cameras called Olympus μ [mju:]^[9] (known as Olympus Stylus in North America).

Linguistics

In phonology:

mora

In syntax:

μP (mu phrase) can be used as the name for a functional projection.^[10]

In Celtic linguistics:

/μ/ can represent an Old Irish nasalized labial fricative of uncertain articulation, the ancestor of the sound represented by Modern Irish mh.

Character encodings

^[11]

Character information
Preview	Μ		μ		µ		Ⲙ		ⲙ
Unicode name	GREEK CAPITAL LETTER MU		GREEK SMALL LETTER MU		MICRO SIGN		COPTIC CAPITAL LETTER MI		COPTIC SMALL LETTER MI
Encodings	decimal	hex	dec	hex	dec	hex	dec	hex	dec	hex
Unicode	924	U+039C	956	U+03BC	181	U+00B5	11416	U+2C98	11417	U+2C99
UTF-8	206 156	CE 9C	206 188	CE BC	194 181	C2 B5	226 178 152	E2 B2 98	226 178 153	E2 B2 99
Numeric character reference	Μ	Μ	μ	μ	µ	µ	Ⲙ	Ⲙ	ⲙ	ⲙ
Named character reference	Μ		μ		µ
ISO/IEC 8859-1					181	B5
ISO/IEC 8859-7	204	CC	236	EC
Code page 437, 850			230	E6	230	E6
Code page 737	139	8B	163	A3
Code page 851, 869	183	B7	230	E6
Code page 1253	204	CC	236	EC
Roman-8, Roman-9			243	F3	243	F3
TeX			\mu		\micro

Character information
Preview	𝚳		𝛍		𝛭		𝜇		𝜧		𝝁
Unicode name	MATHEMATICAL BOLD CAPITAL MU		MATHEMATICAL BOLD SMALL MU		MATHEMATICAL ITALIC CAPITAL MU		MATHEMATICAL ITALIC SMALL MU		MATHEMATICAL BOLD ITALIC CAPITAL MU		MATHEMATICAL BOLD ITALIC SMALL MU
Encodings	decimal	hex	dec	hex	dec	hex	dec	hex	dec	hex	dec	hex
Unicode	120499	U+1D6B3	120525	U+1D6CD	120557	U+1D6ED	120583	U+1D707	120615	U+1D727	120641	U+1D741
UTF-8	240 157 154 179	F0 9D 9A B3	240 157 155 141	F0 9D 9B 8D	240 157 155 173	F0 9D 9B AD	240 157 156 135	F0 9D 9C 87	240 157 156 167	F0 9D 9C A7	240 157 157 129	F0 9D 9D 81
UTF-16	55349 57011	D835 DEB3	55349 57037	D835 DECD	55349 57069	D835 DEED	55349 57095	D835 DF07	55349 57127	D835 DF27	55349 57153	D835 DF41
Numeric character reference	𝚳	𝚳	𝛍	𝛍	𝛭	𝛭	𝜇	𝜇	𝜧	𝜧	𝝁	𝝁

Character information
Preview	𝝡		𝝻		𝞛		𝞵
Unicode name	MATHEMATICAL SANS-SERIF BOLD CAPITAL MU		MATHEMATICAL SANS-SERIF BOLD SMALL MU		MATHEMATICAL SANS-SERIF BOLD ITALIC CAPITAL MU		MATHEMATICAL SANS-SERIF BOLD ITALIC SMALL MU
Encodings	decimal	hex	dec	hex	dec	hex	dec	hex
Unicode	120673	U+1D761	120699	U+1D77B	120731	U+1D79B	120757	U+1D7B5
UTF-8	240 157 157 161	F0 9D 9D A1	240 157 157 187	F0 9D 9D BB	240 157 158 155	F0 9D 9E 9B	240 157 158 181	F0 9D 9E B5
UTF-16	55349 57185	D835 DF61	55349 57211	D835 DF7B	55349 57243	D835 DF9B	55349 57269	D835 DFB5
Numeric character reference	𝝡	𝝡	𝝻	𝝻	𝞛	𝞛	𝞵	𝞵

Image list for readers with font problems

^

References

^ "mu". The Chambers Dictionary (9th ed.). Chambers. 2003. ISBN 0-550-10105-5.
^ "mu". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)
^ Hadley, James (1884). A Greek Grammar for Schools and Colleges. New York: American Book. p. 79.
^ Neoelliniki Grammatiki (Tis Dimotikis).
^ Grammatiki tis Dimotikis Glossas.
^ Ballou, Glen (1987). Handbook for Sound Engineers: The New Audio Cyclopedia (1 ed.). Howard W. Sams Co. p. 250. ISBN 0-672-21983-2. Amplification factor or voltage gain is the amount the signal at the control grid is increased in amplitude after passing through the tube, which is also referred to as the Greek letter μ (mu) or voltage gain (V_g) of the tube.
^ "Nomenclature" NASA
^ "Definition".
^ "Olympus History : μ[mju:] (Stylus) Series".
^ Johnson, Kyle (1991). "Object Positions". Natural Language and Linguistic Theory. 9 (4): 577–636. doi:10.1007/BF00134751. S2CID 189901613.
^ Unicode Code Charts: Greek and Coptic (Range: 0370-03FF)

[1] "mu". The Chambers Dictionary (9th ed.). Chambers. 2003. ISBN 0-550-10105-5.

[2] "mu". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)

[3] Hadley, James (1884). A Greek Grammar for Schools and Colleges. New York: American Book. p. 79.

[4] Neoelliniki Grammatiki (Tis Dimotikis).

[5] Grammatiki tis Dimotikis Glossas.

[6] Ballou, Glen (1987). Handbook for Sound Engineers: The New Audio Cyclopedia (1 ed.). Howard W. Sams Co. p. 250. ISBN 0-672-21983-2. Amplification factor or voltage gain is the amount the signal at the control grid is increased in amplitude after passing through the tube, which is also referred to as the Greek letter μ (mu) or voltage gain (V_g) of the tube.

[7] "Nomenclature" NASA

[8] "Definition".

[9] "Olympus History : μ[mju:] (Stylus) Series".

[10] Johnson, Kyle (1991). "Object Positions". Natural Language and Linguistic Theory. 9 (4): 577–636. doi:10.1007/BF00134751. S2CID 189901613.

[11] Unicode Code Charts: Greek and Coptic (Range: 0370-03FF)

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@@ Line 1: / Line 1: @@
-{{short description|Twelfth in the Greek alphabet}}
+{{short description|Twelfth letter of the Greek alphabet}}
-{{About|||MU (disambiguation){{!}}MU}}
+{{Other uses|MU (disambiguation){{!}}MU}}
+{{Dist|Nu (letter)|M|Em (Cyrillic)}}
+{{technical reasons|µ|the micro sign|Micro-}}
 {{Greek Alphabet|letter=mu}}
-'''Mu''' {{IPAc-en|ˈ|m|(|j|)|uː}}<ref>{{Cite book|title=The Chambers Dictionary|publisher=Chambers|year=2003|isbn=0-550-10105-5|edition=9th|chapter=mu}}</ref><ref>{{OED|mu}}</ref> (uppercase '''Μ''', lowercase '''μ'''; [[Ancient Greek]] {{lang|grc|μῦ}} {{IPA-el|mŷː|}}, {{lang-ell|μι}} or μυ—both {{IPA-el|mi|}}) is the twelfth [[Letter (alphabet)|letter]] of the [[Greek alphabet]], representing the [[voiced bilabial nasal]] {{IPA-el|m|IPA}}. In the system of [[Greek numerals]] it has a value of 40.<ref>{{Cite book |title=A Greek Grammar for Schools and Colleges |last=Hadley |first=James |location=New York |publisher=American Book |year=1884 |page=79}}</ref> Mu was derived from the [[Egyptian hieroglyph]]ic symbol for water, which had been simplified by the [[Phoenicia]]ns and named after their word for water, to become [[𐤌]]{{ref|mem|img}} (mem). Letters that derive from mu include the [[M|Roman M]] and the [[Em (Cyrillic)|Cyrillic М]], though the lowercase resembles a small [[U| Latin U]] (μ).
+'''Mu''' ({{IPAc-en|ˈ|m|(|j|)|uː}};<ref>{{Cite book|title=The Chambers Dictionary|publisher=Chambers|year=2003|isbn=0-550-10105-5|edition=9th|chapter=mu}}</ref><ref>{{OED|mu}}</ref> uppercase '''Μ''', lowercase '''μ'''; [[Ancient Greek]] {{lang|grc|μῦ}} {{IPA-el|mŷː|}}, {{lang-ell|μι}} or μυ—both {{IPA-el|mi|}}) is the twelfth [[Letter (alphabet)|letter]] of the [[Greek alphabet]], representing the [[voiced bilabial nasal]] {{IPA-el|m|IPA}}. In the system of [[Greek numerals]] it has a value of 40.<ref>{{Cite book |title=A Greek Grammar for Schools and Colleges |last=Hadley |first=James |location=New York |publisher=American Book |year=1884 |page=79}}</ref> Mu was derived from the [[Egyptian hieroglyph]]ic symbol for water, which had been simplified by the [[Phoenicia]]ns and named after their word for water, to become [[𐤌]]{{ref|mem|img}} (mem). Letters that derive from mu include the [[M|Roman M]] and the [[Em (Cyrillic)|Cyrillic М]], though the lowercase resembles a small  [[U|Latin U]] (u).
-[[File:Greek mu.png|thumb|Greek letter mu]]
+[[File:Mu uc lc.svg|thumb|Greek letter mu]]
 ==Names==
 ===Ancient Greek===
-In Greek, the name of the letter was written {{lang|grc|μῦ}} and pronounced {{IPA|[mŷː]}}
+In Greek, the name of the letter was written {{lang|grc|μῦ}} and pronounced {{IPA|[mŷː]}}.
 ===Modern Greek===
@@ Line 19: / Line 21: @@
 ===Prefix for units of measurement===
 "μ" is used as a [[unit prefix]] denoting a factor of 10<sup>−6</sup> (one [[millionth]]), in this context, the symbol's name is "[[Micro-|micro]]".
-*[[Metric prefix]]
+* [[Metric prefix]]
-*[[International System of Units]] prefix, also known as "SI prefix"
+* [[International System of Units]] prefix, also known as "SI prefix"
-*The micrometre with symbol "μm", can also referred to as the non-SI term "[[micron]]".
+* The micrometre with a symbol of "μm" can also be referred to as the non-SI term "[[micron]]".
 ===Mathematics===
 "μ" is conventionally used to denote certain things; however, any Greek letter or other symbol may be used freely as a variable name.
+* a [[measure (mathematics)|measure]] in [[measure theory]]
+* [[Mu operator|minimalization]] in [[Computability theory (computer science)|computability theory]] and [[Recursion theory]]
-*a [[measure (mathematics)|measure]] in [[measure theory]]
+* the [[integrating factor]] in [[ordinary differential equations]]
-*[[Mu operator|minimalization]] in [[Computability theory (computer science)|computability theory]] and [[Recursion theory]]
+* the degree of [[Membership (set theory)|membership]] in a [[fuzzy set]]
-*the [[integrating factor]] in [[ordinary differential equations]]
-*the degree of [[Membership (set theory)|membership]] in a [[fuzzy set]]
+* the [[Möbius function]] in [[number theory]]
-*the [[Möbius function]] in [[number theory]]
+* the population [[mean]] or [[expected value]] in [[probability]] and [[statistics]]
+* the [[Ramanujan–Soldner constant]]
-*the population [[mean]] or [[expected value]] in [[probability]] and [[statistics]]
-*the [[Ramanujan–Soldner constant]]
 ===Physics and engineering===
 In [[classical physics]] and [[engineering]]:
-*the [[friction#Coefficient of friction|coefficient of friction]] (also used in aviation as braking coefficient (see [[Braking action]]))
+* the [[friction#Coefficient of friction|coefficient of friction]] (also used in aviation as braking coefficient (see [[Braking action]]))
-*[[reduced mass]] in the [[two-body problem]]
+* [[reduced mass]] in the [[two-body problem]]
-*[[Standard gravitational parameter]] in celestial mechanics
+* [[Standard gravitational parameter]] in celestial mechanics
-*[[linear density]], or mass per unit length, in strings and other one-dimensional objects
+* [[linear density]], or mass per unit length, in strings and other one-dimensional objects
-*[[permeability (electromagnetism)|permeability]] in electromagnetism
+* [[permeability (electromagnetism)|permeability]] in electromagnetism
-*the [[magnetic dipole moment]] of a [[Electric current|current]]-carrying [[Coil (electrical engineering)|coil]]
+* the [[magnetic dipole moment]] of a [[Electric current|current]]-carrying [[Coil (electrical engineering)|coil]]
-*[[Viscosity#Dynamic (shear) viscosity|dynamic viscosity]] in fluid mechanics
+* [[Viscosity#Dynamic (shear) viscosity|dynamic viscosity]] in fluid mechanics
-*the [[Amplifier|amplification]] factor or [[Gain (electronics)|voltage gain]] of a [[triode vacuum tube]]<ref>{{cite book |last=Ballou |first=Glen |author-link=Glen Ballou |title=Handbook for Sound Engineers: The New Audio Cyclopedia |publisher=Howard W. Sams Co. |year=1987 |edition=1 |page=250 |isbn=0-672-21983-2 |quote=''Amplification factor or voltage gain'' is the amount the signal at the control grid is increased in amplitude after passing through the tube, which is also referred to as the Greek letter μ (mu) or voltage gain (V<sub>g</sub>) of the tube.}}</ref>
+* the [[Amplifier|amplification]] factor or [[Gain (electronics)|voltage gain]] of a [[triode]] [[vacuum tube]]<ref>{{cite book |last=Ballou |first=Glen |author-link=Glen Ballou |title=Handbook for Sound Engineers: The New Audio Cyclopedia |publisher=Howard W. Sams Co. |year=1987 |edition=1 |page=250 |isbn=0-672-21983-2 |quote=''Amplification factor or voltage gain'' is the amount the signal at the control grid is increased in amplitude after passing through the tube, which is also referred to as the Greek letter μ (mu) or voltage gain (V<sub>g</sub>) of the tube.}}</ref>
-*the [[electrical mobility]] of a charged particle
+* the [[electrical mobility]] of a charged particle
-*the [[Slowed rotor#Theory|rotor advance ratio]], the ratio of aircraft [[airspeed]] to rotor-tip speed in [[rotorcraft]]<ref>"[http://rotorcraft.arc.nasa.gov/tutorial/Nomenclature.htm#mu Nomenclature]" ''NASA''</ref><ref>[http://dictionary.reference.com/browse/advance+ratio Definition]</ref><!--large download <ref>Oliver, Michael. "[http://dspace.mit.edu/bitstream/handle/1721.1/28910/60495046.pdf;jsessionid=4914214DD2723B08238E70B668D773DC?sequence=1 A parametric analysis of the start-up procedure and flight characteristiscs of a gliding autogyro]" page 43. ''[[Massachusetts Institute of Technology School of Engineering#Aeronautics and Astronautics|MIT Aero]]'', February 2005. Accessed: December 2013. Size: 15MB and 114 pages</ref> -->
+* the [[Slowed rotor#Theory|rotor advance ratio]], the ratio of aircraft [[airspeed]] to rotor-tip speed in [[rotorcraft]]<ref>"[http://rotorcraft.arc.nasa.gov/tutorial/Nomenclature.htm#mu Nomenclature]" ''NASA''</ref><ref>{{Cite web|url=http://dictionary.reference.com/browse/advance+ratio|title=Definition}}</ref><!--large download <ref>Oliver, Michael. "[http://dspace.mit.edu/bitstream/handle/1721.1/28910/60495046.pdf;jsessionid=4914214DD2723B08238E70B668D773DC?sequence=1 A parametric analysis of the start-up procedure and flight characteristiscs of a gliding autogyro]" page 43. ''[[Massachusetts Institute of Technology School of Engineering#Aeronautics and Astronautics|MIT Aero]]'', February 2005. Accessed: December 2013. Size: 15MB and 114 pages</ref> -->
-*the [[pore water pressure]] in saturated soil
+* the [[pore water pressure]] in saturated soil
 In [[particle physics]]:
-*the elementary particles called the [[muon]] and antimuon
+* the elementary particles called the [[muon]] and antimuon
-*the [[proton-to-electron mass ratio]]
+* the [[proton-to-electron mass ratio]]
 In [[thermodynamics]]:
-*the [[chemical potential]] of a system or component of a system
+* the [[chemical potential]] of a system or component of a system
 === Computer science ===
@@ Line 65: / Line 66: @@
 ===Chemistry===
 In [[chemistry]]:
-*the prefix given in [[IUPAC]] nomenclature for a [[bridging ligand]]
+* the prefix given in [[IUPAC]] nomenclature for a [[bridging ligand]]
 ===Biology===
 In [[biology]]:
-*the [[mutation rate]] in population genetics
+* the [[mutation rate]] in population genetics
 * A class of [[Immunoglobulin heavy chain]] that defines [[Immunoglobulin M|IgM]] type [[Antibody|Antibodies]]
 ===Pharmacology===
 In [[pharmacology]]:
-*an important [[opiate receptor]]
+* an important [[opiate receptor]]
 ===Orbital mechanics===
 In [[orbital mechanics]]:
-*[[Standard gravitational parameter]] of a [[celestial body]], the product of the [[gravitational constant]] ''G'' and the [[mass]] ''M''
+* [[Standard gravitational parameter]] of a [[celestial body]], the product of the [[gravitational constant]] ''G'' and the [[mass]] ''M''
-*planetary discriminant, represents an experimental measure of the actual degree of [[Clearing the neighbourhood|cleanliness]] of the orbital zone, a [[wiktionary:criterion|criterion]] for [[IAU definition of planet|defining]] a [[planet]]. The value of μ is calculated by dividing the mass of the candidate body by the total mass of the other objects that share its orbital zone.
+* planetary discriminant, represents an experimental measure of the actual degree of [[Clearing the neighbourhood|cleanliness]] of the orbital zone, a [[wikt:criterion|criterion]] for [[IAU definition of planet|defining]] a [[planet]]. The value of μ is calculated by dividing the mass of the candidate body by the total mass of the other objects that share its orbital zone.
 ===Music===
-*[[Steely Dan|Mu chord]]
+* [[Steely Dan|Mu chord]]
-*Electronic musician [[Mike Paradinas]] runs the label [[Planet Mu]] which utilizes the letter as its logo, and releases music under the pseudonym μ-Ziq, pronounced "music"
+* Electronic musician [[Mike Paradinas]] runs the label [[Planet Mu]] which utilizes the letter as its logo, and releases music under the pseudonym μ-Ziq, pronounced "music"
-*Used as the name of the school idol group μ's, pronounced "muse", consisting of nine singing idols in the anime [[Love Live! School Idol Project]]
+* Used as the name of the school idol group μ's, pronounced "muse", consisting of nine singing idols in the anime [[Love Live! School Idol Project]]
-*Official [[fandom name]] of Kpop group [[F(x) (band)|f(x)]], appearing as either '''MeU''' or 'μ'
+* Official [[fandom name]] of Kpop group [[F(x) (band)|f(x)]], appearing as either '''MeU''' or 'μ'
-*Hip-hop artist Muonboy has taken inspiration from the particle for his stage name and his first EP named Mu uses the letter as its title.
+* Hip-hop artist Muonboy has taken inspiration from the particle for his stage name and his first EP named Mu uses the letter as its title.
 ===Cameras===
-The [[Olympus Corporation]] manufactures a series of digital cameras called Olympus μ {{IPA|[mju:]}}<ref>{{cite web |url=http://www.olympus-global.com/en/corc/history/camera/m_series/ |title=Olympus History : μ[mju:] (Stylus) Series}}</ref> (known as Olympus Stylus in North America)
+The [[Olympus Corporation]] manufactures a series of digital cameras called Olympus μ {{IPA|[mju:]}}<ref>{{cite web |url=http://www.olympus-global.com/en/corc/history/camera/m_series/ |title=Olympus History : μ[mju:] (Stylus) Series}}</ref> (known as [[Olympus Stylus Epic|Olympus Stylus]] in North America).
 ===Linguistics===
 In [[phonology]]:
 * [[mora (linguistics)|mora]]
 In [[syntax]]:
 * μP (mu phrase) can be used as the name for a functional projection.<ref>{{cite journal|last=Johnson|first=Kyle|title=Object Positions|journal=Natural Language and Linguistic Theory|year=1991|volume=9|pages=577–636|doi=10.1007/BF00134751|issue=4|s2cid=189901613}}</ref>
 In [[celtic languages|Celtic]] linguistics:
 * /μ/ can represent an [[Old Irish]] nasalized labial [[fricative]] of uncertain articulation, the ancestor of the sound represented by [[irish language|Modern Irish]] ''mh''.
 ==Character encodings==
+<ref>Unicode Code Charts: [https://www.unicode.org/charts/PDF/U0370.pdf Greek and Coptic (Range: 0370-03FF)]</ref>
-{{more citations needed section|date=June 2015}}
-* Greek Mu / Coptic Mu<ref>Unicode Code Charts: [https://www.unicode.org/charts/PDF/U0370.pdf Greek and Coptic (Range: 0370-03FF)]</ref>
 {{charmap
@@ Line 125: / Line 121: @@
 |namedref1=[[TeX]]|ref1char2=\mu |ref1char3=\micro<!-- at least in LaTeX -->
 }}
-* Mathematical Mu
 {{charmap
@@ Line 143: / Line 137: @@
 |1D7B5|name4=Mathematical Sans-Serif<br />Bold Italic Small Mu
 }}
-These characters are used only as mathematical symbols. Stylized Greek text should be encoded using the normal Greek letters, with markup and formatting to indicate text style.
 ==Image list for readers with font problems==
-#{{note|mem}}[[Image:Phoenician mem.svg|50px]]
+# {{note|mem}}[[Image:Phoenician mem.svg|50px]]
 ==See also==