Or US Customary, I think it's called, (~237ml). (I believe this one and the imperial one (which definitely is) both make some sort of sense in being the same a

Or US Customary, I think it's called, (~237ml). (I believe this one and the imperial one (which definitely is) both make some sort of sense in being the same as half a pint. For whatever reason that's consistent, but the US needed to reinvent the pint (and gallon, ton[ne], ...).)