is named 頤 (yí), "Swallowing". Other
variations include "the corners of the
mouth (providing nourishment)", "jaws"
and "comfort/security". Its inner
(lower) trigram is ☳ (震 zhèn)
shake = (雷) thunder, and its outer
(upper) trigram is ☶ (艮 gèn) bound
= (山) mountain.
