Magic number (programming)

In computer programming, a magic number is any of the following:

  • A unique value with unexplained meaning or multiple occurrences which could (preferably) be replaced with a named constant
  • A constant numerical or text value used to identify a file format or protocol (for files, see List of file signatures)
  • A distinctive unique value that is unlikely to be mistaken for other meanings (e.g., Universally Unique Identifiers)
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