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Jyutping sang1 pik1 zi6
Pinyin shēng pì zì

Definitions (Wiktionary)
  1. noun
    uncommon word (in any language); rare term
  2. noun
    esoteric Chinese character; rarely used Chinese character
Examples (粵典–words.hk)
  1. Cantonese
    生僻字
    生僻字
    saang1 pik1 zi6
    • rare (Chinese) character