Old English, masculine and neuter genitive singular ending.
In the formation of plurals of regular nouns, it is incorrect to use an apostrophe: six pens (not six pen’s). There are a few special occasions, however, in which the apostrophe indicates plurals, as with letters and symbols where s added without punctuation would look odd (or be undecipherable): ABC’s; the five W’s; dot your i’s and cross your t’s; the code is two H’s followed by four #’s.
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