A polyhedron (a 3D geometric shape) that has deltoid-shaped faces, meaning faces with a kite-like or triangle-based form.
From Greek 'delta' (the letter Δ, triangular in shape) + 'hedron' (from Greek 'hedra,' meaning face or side). The term was coined in geometry to describe solids with triangular or kite-shaped faces.
Deltoids appear everywhere in geometry—from the simple kite shape to complex crystal structures. The delta symbol itself was named after the Nile Delta's triangular shape, so a deltohedron literally means 'a shape with triangle-faced sides,' connecting ancient geography to modern math!
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