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Greengrocers' apostrophe

Apostrophes used incorrectly to form plurals are known as greengrocers' apostrophes (also: greengrocer's apostrophes, grocers' apostrophes or grocer's apostrophes, sometimes humorously greengrocers apostrophe's). The term was coined in the United Kingdom where such mistakes are common in the signs and advertisements of greengrocers, e.g. “Apple's and orange's for sale, 50% off”. The practice comes from a widespread ignorance of the use of the apostrophe and the identical sound of the plural and possessive forms of most nouns.