Tsurinawa 吊り縄
Japanese for suspension rope: the line that runs from a harness on the body up to the suspension point, known in English as an upline.
Tsurinawa, also written tsuri nawa (吊り縄), combines tsuri, suspension, with nawa, rope. Shibari Study defines it as the rope used for suspension and gives upline as the English equivalent. Anatomie Studio describes the same line as the one running between the tied person and the suspension point, and lists suspension line and mainline as other names for it. Shibari Study adds that an upline is locked off with a sturdier method than the hitches inside a harness, for safety.