1990: The Curious Second Letters in Oz. and No. May 27, 2020

Not all abbreviations or symbols make sense, especially when some (or even all) of the shortened version has extra letters. For instance, ounce and number are abbreviated Oz. and No. respectively, but in neither case is the last letter of the abbreviation in the word it's supposed to abbreviate. This is because they aren't abbreviating English; Oz. is from the Italian 'onza', and No. is from the Latin 'Numero', though they mean the same things.

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