The Emergency Power Off (EPO) switch in a data center I was in last week. Appropriately labeled, in my opinion. My favorite is actually the old-school pushbutton light switches, though. The lamp next to the switch glows red when they’re off, which makes it easy to find the switch in the dark.

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{ 4 comments… read them below or add one }
It’s the Easy button !!
Heh, that’d be funny. Well, a bright spot in a dark moment, perhaps. Literally.
Hm, a big red button. That looks like it’s meant for pushing.
The only thing missing is a “Do Not Push” label. ;)