x1 (object, event, string, etc.; anything toggleable with x2-many states) represents a bit/shannon/trit/nat (information unit) of logarithmic base x2 (default: 2) where states x3 (ordered list) respectively represent bit states x4 (ordered list; same length as x3)
Examples for binary bits (x1 when x2 = 2): a 0-xor-1 string of length one, a coin flip, the toggleable states of an electrical switch, the direction that a car drives down a road, etc.