Usually means: Undefined or unrepresentable numerical value.
Definitions Related words Mentions
We found 4 dictionaries that define the word Not-a-Number:

General (1 matching dictionary)
  1. Not-a-Number: Dictionary.com

Computing (2 matching dictionaries)
  1. Not-a-Number: Free On-line Dictionary of Computing
  2. Not-a-Number: Encyclopedia

Medicine (1 matching dictionary)
  1. online medical dictionary (No longer online)

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