Kaikyaku 開脚
Japanese for a posture with the legs spread apart; in rope it appears in the names of ties that hold the legs open, such as kaikyaku kani shibari.
Kaikyaku (開脚) is a general Japanese word, also used in gymnastics, for a position in which both legs are stretched and spread apart, to the sides or front and back. In the rope glossaries consulted here it appears as part of longer tie names. Shibari Study lists kaikyaku kani shibari (開脚蟹縛り), the crab tie, as a seated form in which each arm is tied to the leg next to it. English Wikipedia’s list of Japanese ties includes a suspended open-leg tie built on the same word.