What's the Difference Between a Ball on the Wall and an Amo Belt?

i got a tour once of the westminster school, which is attached to westminster abbey in london. And it's been around since forever. I mean, like the middle ages, practically. So they're givin me the tour, the students are giving me the tour. Between classes, they have, it's not a handball court, but it's apla where they kind of play something like hand ball. If the ball goes over there,. It's out of bounds. Do you know what that means? I don't. Well, ts is a gain of debatable etymology, but the the one of the possible urgence is the length of an