Apostrophe in sports team age division: 12s vs. 12's
14397
Plurals of acronyms, letters, numbers — use an apostrophe or not?
46755
A better notation to denote arcs for an American high school textbook
74494
Proper to add tense to acronyms, abbreviations and initialisms
83021
Use of a/an with abbreviations
74322
Why use apostrophe-s to denote possession when using 'of'
89921
possessive apostrophe for two things or persons
51453
Why do eleven and twelve get unique words and not end in "-teen"?
123314
The possessive 's in time expressions
108138
Number agreement when using “(s)” for optional plural
158312
Team as singular or plural
41910
Using "of" or apostrophe, which is more common?
138458
Numeric abbreviations in business quotes
113782
"Year olds" or "year-olds"
84112
General Rules for Creating Abbreviations
14556
What is the proper way to write the plural of a single letter? (another apostrophe question)
53501
Using apostrophes correctly
147651
Should "a" vs "an" be chosen based on an expanded abbreviation?