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A constant compiled into a computer program or [used] in a file format for the purpose of being identifiably unique. A number which could only exist in memory on purpose and rarely by accident. For example, 0 is a bad choice for a magic number, since it's the default value for memory when a computer is turned on. Programmers use them to quickly validate a larger data structure which could crash if it guesses the type wrong, using [the theory] that whatever code put the magic number there probably got the rest of it right, since they would have made it store the magic number AFTER [everything] else checked out. Usually it's something easy for a [programmer] to remember, like DEADBEEF or B00B135 or something equally assinine. It's like a secret signal or whistle you might use with friends when trying to coordinate something sneaky.
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