<Keyboard shortcuts for Shut down, restart, and sleep, Article: HT2448, Modified: March 11, 2010>
Or, try these out for yourself and try to guess what will happen, before you press the keys. 
Control-Eject
Control-Command-Eject
Control-Command-Option-Eject
Control-Shift-Eject
Command-Option-Eject
Of course, as a last resort (or the first, depending on how many vacations you take...), QUOTE
Power button (if the computer is not responding)
Press and hold the power button on the computer for six seconds to shut down the computer.
That also has the advantage of not even requiring a keyboard!
So, how did it get into the "keyboard" list?!
Only the Apple knows!