in reply to RFC: Entity names for square brackets.
I vote for &lsb; and &rsb;. I agree that &sql; calls to mind SQL, but I doubt that most Perl programmers deal much with "lsb" meaning "least significant bit(s)".
Besides which, I call 'em "left square bracket" / "right square bracket", so &lsb; and &rsb; make nice mnemonics. :-)
"One word of warning: if you meet a bunch of Perl programmers on the bus or something, don't look them in the eye. They've been known to try to convert the young into Perl monks." - Frank Willison