"Typo" is related to, but does not come from, the verb "to type". It is short for "typographical error", which, of course, could refer to any error made by a typographer. (The humorous but useful hackish coinage "thinko", used for when the person typing was *thinking* of the wrong thing, pretends that "typo" does come from "to type". The Jargon File also gives "mouso", a ubiquitous kind of error in this point-and-click era.) Arguments of the form "It couldn't have been a typo, because those two keys are nowhere near each other on the keyboard" are a bit tiresome, especially when one keeps the true etymology of "typo" in mind.
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