It’s always a good day to celebrate the apostrophe, but Aug. 15 may be the best day: ’Tis International Apostrophe Day, the annual commemoration of a crooked little line that punches above its weight.

Malcolm Wood, an English teacher in North Yorkshire, England, did a double take recently as he passed by a quiet road, St. Mary’s Walk. The street’s new sign had no apostrophe. The change, part of the ...

Apostrophes are the curly floating commas in sentences that usually indicate possession or a contraction. There are a few set phrases and holidays, however, that also use apostrophes. In fact, ...