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A 40-sided polygon.

A set of four, also called a quartet.

A 14-sided polygon, sometimes called a tetrakaidecagon.

The three 3-polyiamonds are called tetriamonds.

The tensor defined by T^l_(jk)=-(Gamma^l_(jk)-Gamma^l_(kj)), where Gamma^l_(jk) are Christoffel symbols of the first kind.

B_(p+k)=B_k+B_(k+1) (mod p), when p is prime and B_n is a Bell number.

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

An equation or formula involving transcendental functions.

A transformation of period 2.

A relation R on a set S is transitive provided that for all x, y and z in S such that xRy and yRz, we also have xRz.