L5, L6, NEMA 14-50, NEMA 5-15, NEMA 5-20, NEMA 14-30, NEMA 11-30, just to name the ones I deal with at home and at the office... And that's not dealing with anything terribly esoteric, like 3 phase, generators, or industrial equipment.

Petrol has several interfaces as well: diesel and unleaded are slightly different, and leaded is different again.