Which term is associated with the initiation ceremony for sailors crossing the equator?

The term associated with the initiation ceremony for sailors crossing the equator is known as "Crossing the Line." This tradition dates back many years and involves a series of rituals and ceremonies meant to welcome sailors into the "Royal Order of the Shellback," signifying their first crossing of the Equator. During this event, experienced sailors, often referred to as "Shellbacks," conduct an initiation for those who are crossing for the first time, including fun and sometimes demanding challenges.

The other terms listed refer to different naval activities: "Sea Trial" usually pertains to the testing of a ship's performance in the water, "Naval Review" involves a formal inspection of naval vessels, and "Fleet Week" is a celebration that typically features naval ships visiting a port city, allowing the public to explore them. Thus, "Crossing the Line" is distinctly linked to the ceremonial tradition for sailors crossing the Equator.