racker
Pool table preparer
A racker is someone who racks—arranging balls on a pool table, organizing items on shelves, or transferring beer or wine between vessels.
In billiards specifically, the racker sets up the balls before each game: The racker left a gap in the triangle.
The term also appears in compounds like wine racker for storage furniture.
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snooker · balls · table · setup · frame · spot · diamond · eight-ball · nine-ball