This post is regarding the old Macbook Air with no visible # symbol on the Keyboard. On new Macbook Airs – it’s simply Shift-3

Okay, this is a bit ‘niche’-ey. I have a US Macbook air with UK Keyboard layout and have spent a few months passively looking for the ‘hash’ key, whilst sort of admitting to myself that I’d probably bought a £1200 machine with no DVD drive, no changeable battery and NO HASH KEY.
But.. about that one, I was wrong… There is a hash key!
Anyone with a US Macbook Air on UK Layout : Ctrl-Alt-3
Finally!
Chris

Hey! I noticed you added me on Twitter (shift_)
What WordPress plugin did you use for the “Share this” social bookmarking icons?!
Hi Anthony,
It’s called Sociable. It’s available at the wordpress plugin repository.
Chris
Just bought my first mac. I am facing same issue here but ctrl+Alt+3 don’t seem to work for me
Thanks for the tip ! I’ve just inherited a Mac Book Air, and really needed the hash key (for comments in a high level programming language). On my computer is is alt 3 not control alt 3.