礁 reef, sunken rock 17 strokes jōyō, taught in secondary school old JLPT 1 #1977 in newspapers Readings Onショウ In Chinese 礁 Words written with it 暗礁 あんしょう reef 岩礁 がんしょう reef 座礁 ざしょう running aground 環礁 かんしょう atoll