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The locus of lines meeting three given skew lines. ("Regulus" is also the name of the brightest star in the constellation Leo.)

An (n-2)-dimensional face of an n-dimensional polytope.

Three sets of three lines such that each line is incident with two from both other sets.

The polygon formed by the lines tangent to the circumcircle of a polygon. The tangential polygon of an n-gon is itself an n-gon.

A 40-sided polygon.

A transversal line is a line which intersects each of a given set of other lines. It is also called a semisecant.

A 13-sided polygon, sometimes also called the triskaidecagon.

A rotation combined with an expansion or geometric contraction.

A ball of radius 1.

Kepler's original name for the small stellated dodecahedron.