☳ or 震 transcribed zhèn in Hanyu pinyin (romanisation of the Mandarin) and shin according to the reading On' yomi (Japanese), is one of the eight trigrams of the Yi Jing, and thus a figure of the Bāguà.

Also called the eveillor. He is one of the eight parts of the Bāguà and has as a natural image the thunder.

Other images associated with the zhèn are the eveillor, the dragon, the oldest son, the foot, the dark yellow, main street, a reed or a snap ring.