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Space key. That way it won’t accidentally enter an actual letter or command that could be passed to the current active application.
That’s not really much of a problem anymore these days (serious issue in WinXP era), but it’s still the safe key, so I use it.
Edit: I totally botched this. I meant Shift key. Derp.
Space bar is “accept” in many interfaces. If the screen was off but not locked, and a dialog box was focused, hitting space will submit that in some OS.
Control, on the other hand, won’t.