What is the Navy term for a sailor who has crossed the equator?

The term "Shellback" refers to a sailor who has crossed the equator and completed a traditional naval initiation ceremony known as the "line crossing ceremony." This rite of passage is significant in naval tradition, often marking a sailor's transition from a "Polywog," someone who has not yet crossed the equator, to a Shellback. The ceremony typically involves a series of humorous and sometimes challenging events designed to test the sailor's mettle and is steeped in custom and camaraderie. As a result, becoming a Shellback is a proud moment for sailors, symbolizing their experience and dedication to naval life.