Today I learned that those little prongs on the sides of the Kitchen-Aid paddles (that slide in and then turn to lock) are officially called "bayonet fittings" or "bayonet mounts." And that some electrical devices (fuses, light bulbs) are made with them. They're called that, straightforwardly enough, because that's how you used to attach a bayonet to your rifle. Not a mount shaped like a bayonet (my first thought), but a mount for a bayonet.
Let me see if I can find a picture. Oh, never mind, just go to http://en.wikipedia.org/wiki/Bayonet_mount. They've got some good examples.
