ascii(7) - Linux man page
Name
ascii - ASCII character set encoded in octal, decimal, and hexadecimalDescription
ASCII is the American Standard Code for Information Interchange. It is a 7-bit code. Many 8-bit codes (such as ISO 8859-1, the Linux default character set) contain ASCII as their lower half. The international counterpart of ASCII is known as ISO 646.The following table contains the 128 ASCII characters.
C program CWaq\Xaq escapes are noted.