Inversion
Any suspension or position in which the tied person is upside down, hanging head down; in Japanese, sakasa zuri.
An inversion, or inverted suspension, is one in which the person in rope hangs head down. Shibari Study gives the Japanese sakasa zuri for upside-down suspension and kata ashi sakasa zuri for an inversion from a single ankle. Wikipedia notes that inverted positions are usually lifted from the ankles and are hard to hold for long, and its safety section warns that they are especially dangerous in a fall, since landing on the head from a very small height can cause death or paralysis. Ropejam Studio’s advanced dynamic suspension course includes transitions that turn the person upside down and back.