I've heard it called "pound" and "sharp"...
What is the real name for "#"?

A mini tic tac toe board!! =)

It's called a 'hash'... the automated operators on the end of the line never fail to ask you to press the 'hash' (or 'pound' key).

Thank you! The reference to "hash" allowed me to check dictionary.com, and I found this:

Common names: number sign; pound; pound sign;
hash; sharp; crunch; hex; INTERCAL: mesh. Rare:
grid; crosshatch; octothorpe; flash; ITU-T: square,
pig-pen; tictactoe; scratchmark; thud; thump; splat.

I knew there were several unusual words for it.
I had heard the word "octothorpe", and couldn't quite recall it and it has been driving me crazy! Well, maybe now I can get some sleep!

Don

I believe that the proper name for this thing is "octothorpe".