The official international standard on how to arrange letters on the touch tone phone key pad. (Also see the US standard ANSI T1.703)
The Malaysian government seems to be quite clear on what phone key pads should look like in Malaysia
Why the # is also called an Octothorpe, plus a few other juicy tidbits.
The IT wing of the US Military has some good pointers to related standards.
Learn more about Zeebar links