Printed or engraved text, usually showing a company's name and address, at the top of official paper used for letters.
Compound word from 'letter' (written message) and 'head' (top/beginning). Emerged in the 19th century as businesses standardized their official correspondence.
Before computers, a company's letterhead was basically its email signature—the visual proof that your message was official and came from a real business. Fancy letterhead was so important that forgeries were a major crime!
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