chr, ord, character conversion

chr() converts a number into a character, ord() does the opposite:

$string = chr(65) . chr(66) . chr(67); # "ABC" 
$i = ord('A'); # 65

The conversion of multiple characters can also be done with pack( "C*", @list).

my @list = ( 65, 66, 67); 
print pack( "C*", @list) . "\n"; # --> "ABC\n"