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$.50 coins are also pretty rare. I can't think of a single time I've seen them used (or used them).

Well, that explains why I couldn't think what they were called! ('Obviously not a quarter... Dime? No, that's not right...')

They're called "half dollars" (which follows the US mentality of defaulting to fractions where possible): https://en.wikipedia.org/wiki/Half_dollar_(United_States_coi...