http://hea-www.harvard.edu/~fine/OSX/unicode_apple_logo.html
- -

-
- the Apple Symbol - ⌘ -
⌘
-⌘
- the Command Key symbol - ⌥ -
⌥
-⌥
- the Option Key symbol - ⇧ -
⇧
-⇧
- the Shift Key symbol - ⎋ -
⎋
-⎋
- the Escape Key symbol
And while we're at it, some related (not mac-specific):