On a Mac, keyboard shortcuts:
Option + R = ®
Option + 2 = ™
Option + 3 = £
Option + 4 = ¢
Option + 5 = ∞
Option + 8 = •
Option + Shift + “-” = —
Option + Y = ¥
Option + “=” = ≠
Option + Shift + 8 = °
Option + Shift + K =
Option + Shift + 2 = €