Always been 'rum bowl' to me.

Certainly 'gill-pot'; which raises again a linguistic difference ~~ a gill is a half-pint in a northern pub, but a quarter-pint down south. Generally. Wiki - 'a unit of measurement for volume equal to a quarter of a pint'; but northerners of my acquaintance would ask for a gill in a pub when they wanted a half-pint.

~M~