I’ll add tyre pressures - cyclists seem wedded to PSI.

I’m in New Zealand and we use imperial for baby weights, tyre pressure and height. Baking uses some measure like cups (US or imperial?) and teaspoons/tablespoons which I dislike, grams is preferable.

Surely the dumbest though is UK shoe sizing. The increments are barley corns length, a unit of measure which is hilarious. This is for males and children, women’s shoe sizing is apparently US. What a shambles.

I’m sure there are more niche hangovers. https://en.m.wikipedia.org/wiki/Barleycorn_(unit) https://en.m.wikipedia.org/wiki/Shoe_size

Americans also measure gun powder and hard water content in barley corn :) That's what the unit "Grain" is.