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Line segment ranges and pencils which have equal cross ratios are said to be equicross.

A flow line for a map on a vector field F is a path sigma(t) such that sigma^'(t)=F(sigma(t)).

A one-dimensional geometric object such as a pencil or line segment range.

The roulette of the pole of a hyperbolic spiral rolling on a straight line is a tractrix.

A point which lies on at least one ordinary line is called an ordinary point, or sometimes a regular point.

A line segment where two faces of a polyhedron meet, also called a side.

The slope b of a line obtained using linear least squares fitting is called the regression coefficient.

An n-route is defined as a walk of length n with specified initial point in which no line succeeds itself.

Two curves both containing the point P are tangent at P if they share the same tangent line at P.

A curve which intersects some straight line in an infinity of points (but for which not every point lies on this curve).