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A positive-height (outward-pointing) pyramid used in augmentation. The term was introduced by B. Grünbaum.

A space endowed with a non-Euclidean elliptic geometry.

Johnson solid J_(20).

Johnson solid J_(40).

Johnson solid J_9.

Of opposite symmetry under reflection; mirror images.

A 90-sided polygon.

An enneacontahedron is a 90-faced polyhedron.

A 19-sided polygon, sometimes also called the enneakaidecagon.

A mathematical statement of the equivalence of two quantities. The equality "A is equal to B" is written A=B.