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The fixed point with respect to which a pedal curve or pedal triangle is drawn.

Let c=(c_1,...,c_n) be a point in C^n, then the open polydisk is defined by S={z:|z_j-c_j|<|z_j^0-c_j|} for j=1, ..., n.

A point at which three or more polyhedron edges of a polyhedron meet. The concept can also be generalized to a polytope.

An integral which has neither limit infinite and from which the integrand does not approach infinity at any point in the range of integration.

A set S with a single point P removed is called a punctured set, written S\{P}.

The catacaustic of the quadrifolium with arbitrary radiant point is a complicated function. A few example are illustrated above.

If a fixed point is added to each group of a special complete series, then the resulting series is complete.

A point at which two noncrossing branches of a curve meet with different tangents.

Two curves are tangent externally at a point P if they lie on opposite sides of their common tangent at P

Two curves are tangent internally at a point P if they lie on the same side of their common tangent at P