[spolster]

On US Mac keyboards, # is Shift-3. On UK Mac keyboards Shift-3 is the Pound (Sterling) sign. # becomes Alt-3 and is unlabelled on the keyboard.

In the past, I've bought US Mac keyboards just for the #, or switched the keyboard layout in software to US.

[oneeyedpigeon]

I've become used to the alt-3 combo now, but it took a long time. I type # a lot more than I ever type £. $, too.