how do i find the £ sign an an american keyboard

how do i access pound sterling sign on USA purchased MBA?

option 3 = £

Peter

On my iMac with an extended USB wired keyboard, it's OPT+3. Maybe it's different for a laptop.😀

27" i7 iMac (Mid 2011) refurb, OS X Yo (10.10.2), Mavs, ML & SL, G4 450 MP w/10.5 & 9.2.2

Option+3 on all my US macs, regardless of kbd.