In the UK we call # a sharp, I believe in the states it's called a Pound. Indeed you even have it on the same key on the US keyboard as we have the £ sign, that we call a pound.
So for what purpose would you use your # pound symbol and would you ever use our £ symbol for anything?
Though I believe you still call the language C# C-Sharp.
Great stuff people, and thanks.
One further question, would you ever see a sign in a market with:
Tomatoes* per #
as opposed to
Tomatoes** £1 per lb
here in Britain
*pronounced tamayda
**pronounced tomahtoe

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Well, as the other answerers stated:
C# = C Sharp in music
# 7 = "number" 7
# = "pound" sign on the phone number pad
lb. = "pound" in measurement
And we only use your "pound" sign (not even on my keyboard so I can't type it in) when referring to British currency.
BUT, I also wanted to add that most of us pronounce tomato as "tamaydoh" rather that "tamayda."
I'm still embarrassed though. We just butcher this language, don't we?