Apostrophes are commonly used for plurals in signs, in what has come to be called the "greengrocer's apostrophe". It was a standard in the 19th century that has

Apostrophes are commonly used for plurals in signs, in what has come to be called the "greengrocer's apostrophe". It was a standard in the 19th century that has come to be disfavored in literary English. https://en.wikipedia.org/wiki/Apostrophe#Greengrocers.27_apostrophes https://en.wikipedia.org/wiki/Apostrophe#Greengrocers.27_apo...