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LETTERS OF THE ALPHABET

See also ABBREVIATIONS, PLURALS.

1. Letters referred to as letters are set in italic, as are letters that represent value in mathematical equations. Plurals add an italic apostrophe plus a roman s:


the letter p
plural with es
x
squared
Greek letter chi
his Scottish r's
P = 2l + 2w


there are two c's and two m's in accommodate

2. Letters in idiomatic expressions, as nouns, and as musical notes are set in roman.
Plurals add an apostrophe plus s:


S-shaped curve
V-formation
F-word
U-turn
B movies
key of C minor
B-flat major
ABC's
p's and q's
straight A's
Model T's
three R's
X marks the spot