• bullet
∑ ∞ ≠ math symbols
™ ® © rights-marks
¢ £ ¥ € currency symbols

But did you know that most browsers can also display...

★ ☆ stars
☀ ☁ ☂ ☃ weather symbols
☎ ☏ ✆ telephones
☠ ☢ ☣ hazard symbols
☩ ☪ ✝ ✡ religious symbols
☭ ☮ political symbols
☹ ☺ ☻ smiley faces
♔ ♕ ♖ ♗ ♘ ♙ ♚ ♛ ♜ ♝ ♞ ♟ chess pieces
♠ ♥ ♦ ♣ card suits (and in outline: ♤ ♡ ♢ ♧)
♩ ♪ ♫ ♬ ♭ ♮ ♯ musical notes
✁ ✂ ✃ ✄ scissors/cut icons

I didn't, until I cam across this Expanded HTML Entity Reference page.