double tetragonal pyramid

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Dynamic rectangle — A dynamic rectangle is a right angled, four sided figure (a rectangle) with dynamic symmetry, which in this case, means that aspect ratio (height divided by width) is a distinguished value in dynamic symmetry, a proportioning system and natural… … Wikipedia
8 (number) — Evolution of the glyphIn the beginning, various groups in India wrote eight more or less in one stroke as a curve that looks like an uppercase H with the bottom half of the left line and the upper half of the right line removed. At one point this … Wikipedia
Anatase — [ Crystals from Gouveia, Minas Gerais, Brazil ] Anatase is one of the three mineral forms of titanium dioxide, the other two being brookite and rutile. It is always found as small, isolated and sharply developed crystals, and like rutile, a more… … Wikipedia
Zirconoid — ir con*oid, n. [Zircon + oid.] (Crystallog.) A double eight sided pyramid, a form common with tetragonal crystals; so called because this form often occurs in crystals of zircon. [1913 Webster] … The Collaborative International Dictionary of English
zirconoid — noun A double eight sided pyramid, a form common with tetragonal crystals; so called because this form often occurs in crystals of zircon … Wiktionary

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