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The symbol +/- is used to denote a quantity which should be both added and subtracted, as in a+/-b. The symbol can be used to denote a range of uncertainty, or to denote a ...

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}.

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)).

The symbol ¬ used to denote the negation operation ("NOT") in symbolic logic, also called "logical not."

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.

The covariant derivative of a contravariant tensor A^a (also called the "semicolon derivative" since its symbol is a semicolon) is given by A^a_(;b) = ...