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A point at the intersection of two or more grid lines in a point lattice.

The point of coincidence of P and P^' in Fagnano's theorem.

A fixed point for which the eigenvalues are complex conjugates.

A fixed point which has one zero eigenvector.

A point x_0 at which the derivative of a function f(x) vanishes, f^'(x_0)=0. A stationary point may be a minimum, maximum, or inflection point.

For every partition of all the points on a line into two nonempty sets such that no point of either lies between two points of the other, there is a point of one set which ...

The trilinear quotient of two points p:q:r and u:v:w is the point p/u:q/v:r/w.

When a point P moves along a line through the circumcenter of a given triangle Delta, the pedal circle of P with respect to Delta passes through a fixed point (the Griffiths ...

The point that inversion of a curve is performed with respect to.

A pivot point of a curve is a fixed point Q such that points P lying on the curve and their (isogonal, isotomic, etc.) conjugates are collinear with Q.