滄そう海かい

• 滄海遺珠そうかいのいしゅ

  hidden gem; unrecognized talent

• 滄そう海かいUsage33%

  Standard kanji form; 滄 means 'blue' or 'vast water'.

• 蒼そう海かいUsage67%

  Variant using 蒼, also meaning 'blue' or 'deep blue'.

Sino-Japanese compound from 滄 (blue, vast water) and 海 (sea). The exact historical derivation is uncertain, but the spelling is conventionally associated with the deep blue ocean.