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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) = ...

The symbol union , used for the union of sets, and, sometimes, also for the logical connective OR instead of the symbol v (vee). In fact, for any two sets A and B x in A ...

The set difference A\B is defined by A\B={x:x in A and x not in B}. Here, the backslash symbol is defined as Unicode U+2216. The set difference is therefore equivalent to the ...

A pair of overdots placed over a symbol, as in x^.., most commonly used to denote a second derivative with respect to time, i.e., x^..=d^2x/dt^2.