Ba = 8, liao = joint cavity
Location of the Baliao points
The Bladder meridian goes up and then comes back down to pass through the 4 sacral foramina.
The points are called Shangliao (upper crevice) BL31, Ciliao (second crevice) BL32, Zhongliao (central crevice) BL33 and Xialiao (lower crevice) BL34.
They are generally referred to as the Baliao points (the 8 liao points, 4 on each side).

Book - Meridians and acupuncture points
Illustrated book: 183 points
Therapeutic functions of the Baliao points
- Local mechanical lumbosacral problems, or related to the front of the lesser pelvis: penis in men, gynecological problems in women, rectum (hemorrhoids), bladder;
- Dystocic (= very difficult) labor;
- Tonification of the Kidneys with massage.
In acupuncture, transfixion (generally meaning that the needle passes right through).