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The wallpaper groups are the 17 possible plane symmetry groups. They are commonly represented using Hermann-Mauguin-like symbols or in orbifold notation (Zwillinger 1995, p. ...

The Jacobi symbol, written (n/m) or (n/m) is defined for positive odd m as (n/m)=(n/(p_1))^(a_1)(n/(p_2))^(a_2)...(n/(p_k))^(a_k), (1) where m=p_1^(a_1)p_2^(a_2)...p_k^(a_k) ...

The Möbius function is a number theoretic function defined by mu(n)={0 if n has one or more repeated prime factors; 1 if n=1; (-1)^k if n is a product of k distinct primes, ...

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.

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.