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Zhen Wei Lei (震為雷 ䷲) — Thunder Doubled
Also known as: 重震 · Hexagram 51 · ䷲
The 51st hexagram; Thunder over Thunder, symbolising sudden shock that startles into awareness and self-examination.
Zhen Wei Lei is the 51st hexagram, doubling the Thunder trigram (☳ over ☳). The judgement "震來虩虩，笑言啞啞。震驚百里，不喪匕鬯" describes a shock that first frightens, then gives way to composed laughter — one who remains steady through the tremor does not drop the sacred ladle.
The Great Image reads "洊雷，震；君子以恐懼修省" ("Repeated thunder; the noble person, in awe and fear, examines and corrects the self"). In divination Zhen signals a sudden jolt or upheaval that, met calmly, becomes a catalyst for renewal.