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A one-dimensional line segment where two two-dimensional faces of an n-dimensional polytope meet, also called a side.

A circular cone the centers of whose sections form a line perpendicular to the bases. When used without qualification, the term "cone" often refers to a right circular cone.

A circular cylinder the centers of whose sections form a line perpendicular to the bases. When used without qualification, the term "cylinder" often refers to a right ...

A translation along a straight line L and a rotation about L such that the angle of rotation is proportional to the translation at each instant. Also known as a twist.

If a triangle is inscribed in a conic section, any line conjugate to one side meets the other two sides in conjugate points.

The distance a point moves due to shear divided by the perpendicular distance of a point from the invariant line.

The mean square deviation of the best local fit straight line to a staircase cumulative spectral density over a normalized energy scale.

A horizontal line placed under a symbol to indicate some special property. Underscores are sometimes used instead of over-arrows or bold typeface to indicate a vector, for ...

A diagonal slash resembling the solidus, but with slightly less slant, used to denote division for in-line equations such as a/b, 1/(x-1)^2, etc.

A linkage used in the original steam engine to turn back-and-forth motion into approximately straight-line motion.