Yea I know what you mean. We built our home security and nobody knew what the heck it was. Here's a better one. Remember the dummy jack pins that they used to make or break a circuit? Usually white and went into what looked like a head phone jack? The switch had anywhere from 4-10 contacts I think. We wired our car coils through them to ground. When you parked the car you pulled out the pin and took it with you. Thieves looked for toggle switches :>} We never had one stolen that was wired like that.
I do remeber the dummy jack's ,saw a couple once, my father quick the pole climing a few yrs before I was born, work out of a CO then in downtown L.A.