A three-dimensional solid shape whose surfaces are all identical equilateral triangles, forming perfectly symmetrical geometric figures.
Composed of 'delta' (the triangular Greek letter) and 'hedron' (Greek 'hedra,' meaning face). Named because the faces are triangles resembling the letter delta.
A deltahedron with 8 faces (octahedron) appears throughout nature—in crystal structures, molecular geometry, and even in the arrangement of atoms in certain metals, showing that nature 'prefers' these efficient geometric solutions.
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