2003 October 22
In USMA 27237 Marcus asks for a symbol for year.
As others have reported, BIPM has no symbol for year.
IEEE/ASTM SI10 shows "year of 365 days (y)" on page 33.
Note that this is in Annex B. Annex B is "informative" which
is to say it is not part of the standard.
ISO 1000-1992 lists time units in Annex A (normative) on
page 8 in item 1-7. "Normative" means it is part of the standard.
In the remarks column 7 is this note:
Other units such as week, month and year (a)
are in common use. The definitions of month and
year often need to be specified.
ISO 31-1992 lists time units in Annex B (informative)
Other non-SI units. On page 11 in item 1-7 under "Name of
unit with symbol" we see
year, a
Robert H Bushnell PhD PE
chair ASTM Committee E43 on SI Practice
