the.com/pool table

means A cloth-covered table with pockets at the corners and sides, used for playing billiard games like pool where you knock balls into the holes with a cue stick.

from 'Pool' here has nothing to do with swimming — it comes from the French 'poule,' meaning 'hen,' which became French slang for a collective stake or pot of money bet by multiple players on a game. English borrowed 'pool' in that gambling sense of a shared wager, and because pocket billiards was commonly played for stakes, the game itself became known as 'pool,' with the furniture it's played on simply inheriting the name.