"Let me assure you that to us here at First National, you're not just a
number. You're two numbers, a dash, three more numbers, another dash
and another number."
-- James Estes
magic number n.
[Unix/C; common] 1. In source code
some non-obvious constant whose value is significant to the
operation of a program and that is inserted inconspicuously in-line
(hardcoded), rather than expanded in by a symbol set by a
commented #define....