RichThesaurus
us
us
synonyms
lowercase letters ... form the plural with an apostrophe and an s". The Oxford Style Manual on page 116 advocates the use of common sense.
states on page 602 that The 15th edition of The Chicago Manual of Style states in paragraph 7.16
"To avoid confusion
U's
after noting that the usage has changed
There is some difference of opinion regarding the use of apostrophes in the pluralization of references to letters as symbols. New Fowler's Modern English Usage
Us
u's
ues
we
little old me
myself
you
yours truly
my ass
ourself
me
ourselves
himself
itself
they
each other
herself
mine
my
I
us
antonyms