ASCII (American Standard Code for Information
Interchange), generally pronounced [ˈæski], is a character encoding
based on the English alphabet. ASCII codes represent text in
computers, communications equipment, and other devices that work
with text. Most modern character encodings have a historical basis
in ASCII.
ASCII was first published as a standard in 1967 and was last
updated in 1986. It currently defines codes for 33 non-printing,
mostly obsolete control characters that affect how text is
processed, plus the following 95 printable characters (starting
with the space character):
!"#$%&'()*+,-./0123456789:;<=>?
@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_
`abcdefghijklmnopqrstuvwxyz{|}~
for more info, pls refer to wiki
see also ASCII Art