Ultimate Unwrap 3D Question

Can anyone tell me the keyboard shortcut for toggling 3d selection mode? I know there`s a button up top but I remember there being a keyboard shortcut too that I cannot remember :(

Please help, it`s driving me mad...

Jason.

I think it's S.

Go to 'Options>Hotkeys...' to view and set key assignments.

It is S. Thanks Amon. I couldn`t find it in the list despite looking.

Jason.