A projector that displays images on a screen; also British slang for a BMW car, or a batsman in cricket hit by a ball.
From beam (light ray) + -er (one that). In cricket, from the idea of a ball 'beaming' at the batter. BMW slang is a rhyming-slang association.
One word, completely different meanings in different places—'beamer' means projector in America, BMW in Britain, and 'that hit him in the head' in cricket—same word, three worlds.
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