CIRCLE WITH A DOT

@alice The German term is "Scheibenschloss". And yes, it's in reference to the wafers that interlock with the core unless pushed exactly into the middle. The interlocking part is sometimes called "Schwalbenschwanz" because of its profile.

@alice Ah, yes. Sorry, I am used to the German names and this one doesn't translate 1:1.

@alice The less secure ones have disc locks for minimum jiggling resistance.

@funz @pluralistic Cory Doctorow's Walkaway has a very similar setting: the system only works for the ultra-rich, so some people decide to literally walk away from it.