Big Dogger.. Is of course 100% correct but I do have one nit.. This is a matter of language.
Many of use refer to that "2 pole" breaker as double or ganged or 2 breakers.
In all case we mean exactly what you said, 2 pole ganged.
I have seen 2 pole breakers with a single lever or button,, They are sometimes used as MAIN breakers.. but I've never seen them on branch circuits.. No reason they can't be used on branch circuits that I know of, Just never seen it done.
Usually these are at least 100 amp though.