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The set theory symbol (aleph) for the cardinal number of a well-orderable infinite set.

The backslash symbol \ is used to denote a set difference, quotient group, or integer division.

The antisymmetric parts of the Christoffel symbol of the second kind Gamma^lambda_(munu).

The digon is the degenerate polygon (corresponding to a line segment) with Schläfli symbol {2}.

For p an odd prime and a positive integer a which is not a multiple of p, a^((p-1)/2)=(a/p) (mod p), where (a|p) is the Legendre symbol.

Little-omega notation is the inverse of the Landau symbol o, i.e., f(n) in o(phi(n)) <==> phi(n) in omega(f(n)).

sigma=1/tau, where tau is the torsion. The symbol phi is also sometimes used instead of sigma.

The symbol ; given special meanings in several mathematics contexts, the most common of which is the covariant derivative.

A long division in which most or all of the digits are replaced by a symbol (usually asterisks) to form a cryptarithmetic.

The process of computing or obtaining an integral. A more archaic term for integration is quadrature.