Tags
constants, defined values, global constants, literal values, literals, named constants, named values, numerical constants, P.J. Plauger, string constants
Along with “always use less-than” is another great piece of always advice, except this one is a prohibition, a never rather than an always (same thing, really, from a programmer’s point of view).
It has to do with never having literal values embedded in your code!
The Hard-Core Coder 