A solid three-dimensional shape with nine flat faces.
From Greek 'ennea' (nine) + 'hedron' (face, side), with '-on' as a common neuter singular ending. The term entered English through mathematical and crystallographic literature in the 18th-19th centuries.
An enneahedron is one of the rarest shapes you'll encounter in geometry—yet it appears naturally in some mineral crystals and is mathematically proven to exist, making it a perfect example of how mathematics predicts things in nature that seem impossibly specific.
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