䷔

Symbol
Hexagram 21 is named 噬嗑 (shì kè), "Gnawing Bite". Other variations include "biting through" and "biting and chewing". Its inner (lower) trigram is ☳ (震 zhèn) shake = (雷) thunder, and its outer (upper) trigram is ☲ (離 lí) radiance = (火) fire.
 * 1)  Biting through.