Hashira 柱
Japanese for pillar or post; hashira shibari is a tie that binds a person to, or against, a vertical post.
Hashira (柱) is the Japanese word for a pillar: the dictionary Daijisen defines it as a vertical member standing on the ground, a foundation stone or a sill that carries the weight of the roof, beams and floors above. Shibari Study notes that the word refers to the vertical wooden beams of a traditional Japanese house and defines hashira shibari as a tie that uses such a pillar for support. Rope365 files it under the English name pillar tie, defined as binding a person to an upright post.