Mune nawa 胸縄
Japanese for chest rope: the wraps around the chest in a box tie, and by extension a name for a chest harness that leaves the arms free.
Mune nawa, also written munenawa, joins mune (chest) and nawa (rope). Japanese Wikipedia uses the word in the name 後手胸縄縛り for the tie in which back-tied arms are held by rope wrapped above and below the chest, and Nawapedia lists munenawa among the many alternative names of gote takatekote. Rope365 files munenawa under both the chest harness and the box tie. Shibari Study gives munenawa as another name for a chest harness that leaves the arms out, and in its entry for shinju calls munenawa the more linguistically fitting word.