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The vectors +/-a_1, ..., +/-a_n in a three-space form a normalized eutactic star iff Tx=x for all x in the three-space.

The sporadic group HJ, also denoted J_2.

A curve and its polar reciprocal with regard to the fixed conic have the same Halphen transformation.

The rules for the multiplication of quaternions.

Objects which are identical except for a mirror reflection are said to display handedness and to be chiral.

A right-angled parallelepiped with dimensions a×ab×abc, where a, b, and c are integers.

A polynomial function of the elements of a vector x can be uniquely decomposed into a sum of harmonic polynomials times powers of |x|.

A database accessed by one or more hash functions.

The head of a vector AB^-> is the endpoint B, i.e., the point at which the arrow is placed.

An associative ring, also called a Hecke ring, which has a technical definition in terms of commensurable subgroups.