en.wikipedia.org/wiki/Digit_(unit)

Britain

Main article: English units of measurement

A digit (lat. digitus, “finger”), when used as a unit of length, is usually a sixteenth of a foot or 3/4" (1.905 cm for the international inch).[6] The width of an adult human male finger tip is indeed about 2 centimetres.

Full standardization on decidigits it is!