What was the name of the Vulcan ritual combat in 'Amok Time'?

The Vulcan ritual combat in “Amok Time” was called the kal-if-fee. During the Vulcan wedding ceremony, T’Pring invokes this traditional physical challenge and chooses Captain Kirk as Spock’s champion. The contest is fought to determine the marriage’s outcome and is treated as a deadly battle.

The kal-if-fee is part of the larger Vulcan marriage ritual associated with pon farr, the mating cycle that drives Spock to return to Vulcan. These terms are often mixed up: pon farr is the biological condition, while the kal-if-fee is the challenge or combat that occurs within the wedding proceedings. The ceremony is overseen by T’Pau, one of Vulcan’s respected elders.

Kirk and Spock fight using traditional weapons including the lirpa and ahn-woon. Spock believes Kirk has died, but Dr. McCoy secretly uses a neuroparalyzer to preserve Kirk’s life. The episode, first broadcast in 1967, also introduced the Vulcan salute and remains the Original Series’ main depiction of Vulcan wedding customs.