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A space endowed with a non-Euclidean elliptic geometry.

Johnson solid J_(20).

Johnson solid J_(40).

Johnson solid J_9.

Johnson solid J_(18).

Johnson solid J_7.

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.