Yaoyi yāo yí · 腰宜

Location. On the low back, 3 cun lateral to the lower border of the spinous process of the fourth lumbar vertebra; one point on each side.

The name says what the point is for rather than where it is: yi means fitting or suitable, so the name reads as the point that suits the low back. It is a paired point outside the fourteen channels, on the fleshy part of the low back lateral to the fourth lumbar vertebra. Source texts differ on the exact lateral distance, with some giving three cun and others a handbreadth measured differently, so the location should be read as a region on the low back rather than a single exact spot. Later literature discusses it in the context of the low back. Its reported effects are not established by modern research and this entry makes no claim of benefit.