Outer gate.
It is a very important point , as it is a crossing point with the Yangweimai, which governs the entire surface of the body.
Location of Waiguan
Waiguan is located on a line running through the middle of the outer side of the forearm, 2 cun above the wrist.

Book - Meridians and acupuncture points
Illustrated book: 183 points
Therapeutic functions of Waiguan
- Waiguan is used to release the exterior, expel Wind, Cold and Heat, against all external attacks.
It is used more for Wind-Heat than for Wind-Cold; - It is a point that effectively activates the Qi in the Shaoyang (Triple Burner and Gallbladder): obstruction or blockage syndromes of the GB or TB.
Headaches, pain in the flanks and along the lateral side of the arms, hips, thighs and legs.
It is combined with Zulinqi to drain and clear Heat.