SymbolNameWindows Alt CodeMac Shortcut
ØDiameterAlt+0216⌥+⇧+O
±Plus / MinusAlt+241⌥+⇧+=
°DegreesAlt+248
∙DotAlt+249
³CubedAlt+252
²SquaredAlt+253
–Long DashAlt+0150
µGreek muAlt+0181

Usage

Press and hold Alt then type the numeric code using a keypad. If you know how to do alt-codes using a ten-key-less keyboard, please reply.