The green square is an item used in The Eyes of Glouphrie and The Path of Glouphrie. It has a value of 16 in Oaknock's and Yewnock's machine, as calculated by multiplying the value of the shape's colour and the number of sides the shapes have:
The item's name was changed from "A green square" to "Green square".
13m ago - Minomelo
22m ago - Bosby
23m ago - [anonymous]
44m ago - Spineweilder