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== Definitions ==
A '''preferred IUPAC name''' or '''PIN''' is a name that is preferred among two or more IUPAC names. An '''IUPAC name''' is a [[Systematic_name#In_chemistry | systematic name]] that meets the recommended IUPAC rules. IUPAC names include retained names. A '''general IUPAC name''' is any IUPAC name that is not a "preferred IUPAC name". A '''retained name''' is a traditional or otherwise often used name, usually a [[trivial name]], that may be used in IUPAC nomenclature.<ref name=Chapter1>IUPAC Provisional Recommendations 2004, par. 10-12, [http://old.iupac.org/reports/provisional/abstract04/BB-prs310305/Chapter1.pdf Chapter 1]</ref>
Since systematic names often are not human-readable a PIN may be a retained name. Both "PINs" and "retained names" have to be chosen (and established by IUPAC) explicitly, unlike other IUPAC names, which automatically arise from IUPAC nomenclatural rules. Thus, the PIN is sometimes the retained name (e.g., phenol and acetic acid, instead of benzenol and ethanoic acid), while in other cases, the systematic name was chosen over a very common retained name (e.g., propan-2-one, instead of acetone).
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