U·ni·corn

A mythical animal typically represented as a horse with a single straight horn projecting from its forehead.

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Something that is highly desirable but difficult to find or obtain.

A start-up company valued at more than a billion dollars, typically in the software or technology sector.

A carriage drawn by three horses.

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Middle English: via Old French from Latin unicornis, from uni- ‘single’ + cornu ‘horn’, translating Greek monokexrōs.