The code "\x" is also an escape sequence beginning a hexadecimal number value.
Also "\f" is the escape sequence for formfeed.
\a - BELL
\b - BACKSPACE
\f - FORMFEED
\n - LINEFEED
\r - RETURN
\t - TAB
\v - VERTICAL TAB
\x - hexadecimal value for character
\o - octal value for character
\u - unicode number for character