Bump bar
Bumping a ticket means marking it done and clearing it from the live kitchen queue. A bump bar is the row of physical buttons that does it; on a touchscreen it is the large control at the bottom of the ticket, which has to be reachable with a knuckle rather than a clean fingertip. Recall - bringing a ticket back - matters as much as bump, because tickets get cleared by accident several times a week.
In practice
Bumping a ticket means marking it done and removing it from the live queue. A bump bar is the physical buttons that do it; on a touchscreen it is the big obvious control at the bottom of the ticket, which has to be reachable with a knuckle.
Recall matters as much as bump. Tickets get cleared by accident several times a week, and a system without one-tap recall turns that into a phone call with a customer.
Both actions should be logged, because "how long did that order actually take" is answerable only if the moment it was marked ready is recorded.
Also called: bump, recall order.