- The percent sign (a corruption of how you'd write parts-per-100).
- In BBC BASIC, a variable name suffix denoting an integer. So "
LET I%=3.14159 : PRINT I%" would print "3". The one-letter integer variables @%,A%,...,Z% were even more special: they were stored in fixed places in page 4 (&400..&4FF), so access to them didn't go through a symbol table, and was fast.
- In C (and awk, C++, Perl, Python, TCL, PHP, and every other language out there after C), the "modulo" operation. Be careful with negative arguments, though!
- In csh and derivatives (and copycats!) a prefix to denote a job.
- In Perl, a variable prefix denoting a hash.
- In Nethack, FOOD.
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