Usually means: Function indicating the number's sign.
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We found 9 dictionaries that define the word signum:

General (5 matching dictionaries)
  1. signum: Merriam-Webster
  2. Signum, signum: Wordnik
  3. signum: Wiktionary
  4. SIGNUM: Dictionary.com
  5. Signum (Nanoha), Signum (magazine), Signum (musical group), Signum: Wikipedia, the Free Encyclopedia

Art (1 matching dictionary)
  1. Glossary of Stamp Collecting Terms (No longer online)

Computing (1 matching dictionary)
  1. signum: Encyclopedia

Miscellaneous (1 matching dictionary)
  1. SIGNUM: Acronym Finder

Science (1 matching dictionary)
  1. Signum: Eric Weisstein's World of Mathematics

Definitions from Wiktionary (signum)

noun:  A sign, mark, or symbol.
noun:  (history) A medieval tower bell used particularly for ringing the eight canonical hours.
noun:  (mathematics) A function that extracts the sign of a real number x, yielding −1 if x is negative, +1 if x is positive, or 0 if x is zero.

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