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We found 3 dictionaries that define the word signum function:

General (2 matching dictionaries)
  1. signum function: Wiktionary
  2. Signum function: Wikipedia, the Free Encyclopedia

Science (1 matching dictionary)
  1. signum function: PlanetMath Encyclopedia

Definitions from Wiktionary (signum function)

noun:  (mathematics) The function that determines the sign of a real number, yielding −1 if negative, +1 if positive, or otherwise zero.

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