IEEE Std 260.1-2004

IEEE Std 260.1-2004 was a standard from the Institute of Electrical and Electronics Engineers that provided standard letter symbols for units of measurement for use in all applications in multiple contexts. It has been withdrawn.
It covers primarily SI units and customary inch–pound units. The symbols are sorted in alphabetical order of name from ampere to zetta, including barrel, bit, foot, inch, microinch, kibibyte, kilowatthour, quart, slug and year. In some cases the same symbol is used for different units. Examples are the symbols B, Gb, L and rad.