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., Globally Unique Identifiers)

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