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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.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.Google's Protocol Buffers "zig-zag encoding" is a system similar to

**sign**-and-magnitude, but uses the least significant bit to represent the**sign**and has a single representation of zero. This allows a variable-length quantity encoding intended for nonnegative (unsigned) integers to be used efficiently for signed integers.**Elder Sign**may refer to: .**Elder Sign**(Cthulhu Mythos), a fictional element in the Cthulhu Mythos by H. P. Lovecraft**Elder Sign**, a cooperative card and dice game published by Fantasy Flight Games**Sign extension**(abbreviated as sext) is the operation, in computer arithmetic, of increasing the number of bits of a binary number while preserving the number's**sign**(positive/negative) and value. This is done by appending digits to the most significant side of the number, following a procedure dependent on the particular signed number ...The

**ruble sign**, ₽, is the currency**sign**used for the Russian ruble, the official currency of Russia. Its form is a Cyrillic letter Р with an additional horizontal stroke. The design was approved on 11 December 2013 after a public poll that took place a month earlier.In linguistics, the

**null sign**is used to indicate the absence of an element, such as a phoneme or morpheme.. Morphology. The English language was a fusional language, this means the language makes use of inflectional changes to convey grammatical meanings.In medicine,

**Murphy's sign**(Also called Sweeney’s**sign**) is a maneuver during a physical examination as part of the abdominal examination. It is useful for differentiating pain in the right upper quadrant. Typically, it is positive in cholecystitis, but negative in choledocholithiasis, pyelonephritis, and ascending cholangitis