Tilde on the Italian keyboard

I've been having an interesting time this week battling the italian keyboard. At long last I've found the answer to the trickiest problem so far: Where is the tilde key? The answer is F12 on my laptop, and it only works in putty windows which is all I really need. It rings the bell but that's a small price to pay.

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PS curly braces, { and } are Shift-AltGr-è and Shift-AltGr-+ respectively.