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The sign of a permutation can be explicitly expressed as sgn(σ) = (−1) N(σ) where N(σ) is the number of inversions in σ. Alternatively, the sign of a permutation σ can be defined from its decomposition into the product of transpositions as sgn(σ) = (−1) m. where m is the number of transpositions in the decomposition.

The less-than sign is a mathematical symbol that denotes an inequality between two values. The widely adopted form of two equal-length strokes connecting in an acute angle at the left, <, has been found in documents dated as far back as the 1560s.

The currency sign ¤ is a character used to denote an unspecified currency.It can be described as a circle the size of a lowercase character with four short radiating arms at 45° (NE), 135° (SE), 225° (SW) and 315° (NW).

The bow and arrow sign is an endoscopic sign for determining the location of the ileocecal valve during colonoscopy.Identifying the ileocecal valve in a colonoscopy is important, as it indicates that the entire colon has been visualized.