You are viewing the version of this documentation from Perl blead. This is the main development branch of Perl. (git commit bad0f9e559329f2d3925b9e3ea9f71ca2928791c)
ord EXPR
ord

Returns the code point of the first character of EXPR. If EXPR is an empty string, returns 0. If EXPR is omitted, uses $_. (Note character, not byte.)

For the reverse, see chr. See perlunicode for more about Unicode.