Fair point about and/or, but there's still a consistent pattern to that usage - also he/she, etc. I'm having trouble coming up with cases besides US dates where

Fair point about and/or, but there's still a consistent pattern to that usage - also he/she, etc. I'm having trouble coming up with cases besides US dates where it isn't used to mean one of these two things: "of": like one half (1/2) meaning one of two, or km/h meaning kilometers per hour, or page 14/55. In these contexts it means something within something else. In both cases there's the strong mathematical connotation of a numerator and a denominator. "or": like in and/or or he/she. The symbol has clear connotations, and the American date-format deviates from those.