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  2. Sign function - Wikipedia

    In mathematics, the sign function or signum function (from signum, Latin for "sign") is an odd mathematical function that extracts the sign of a real number. In mathematical expressions the sign function is often represented as sgn. To avoid confusion with the sine function, this function is usually called the signum function.

  3. Parity of a permutation - Wikipedia

    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.

  4. Less-than sign - Wikipedia

    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.

  5. Currency sign (typography) - Wikipedia

    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).

  6. Bow and arrow sign - Wikipedia

    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.

  7. Single sign-on - Wikipedia

    Single sign-on (SSO) is an authentication scheme that allows a user to log in with a single ID and password to any of several related, yet independent, software systems. True single sign-on allows the user to log in once and access services without re-entering authentication factors.

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