Also known as: 土の字拘束, 四肢拘束, 土字拘束
A style of Immobilization where the body forms the shape of the kanji "土" (Tsuchi), with the arms and legs separated straight out into a Spread Eagle Position.
While often depicted with limbs recessed into mechanical sockets, the term applies to any method that maintains this specific "spread-eagle" silhouette.