Intercut
Also: INTERCUT
An intercut is an instruction to cut back and forth between two locations that are happening at the same time — most often a phone call between two rooms. Writing "INTERCUT" once lets the dialogue alternate without repeating a full slugline for every switch, keeping the exchange fast on the page.
Intercutting links two simultaneous scenes — classically both ends of a phone conversation — so the editor cuts between them. The writer establishes both locations, then writes "INTERCUT" (or "INTERCUT — SAM'S CAR / JORDAN'S KITCHEN") and lets the dialogue run as a single back-and-forth.
The payoff is pace. Without the intercut convention, every line swap would need its own scene heading, which would bog the exchange down and bury the rhythm of the conversation.