金鐘罩 [－钟－]

Jyutping gam1 zung1 zaau3
Pinyin jīn zhōng zhào

Definitions (Wiktionary)
  1. noun, figuratively
    absolute protection; impenetrable defence
  2. noun
    golden shield (a legendary Chinese martial art which makes the body invulnerable and impenetrable by any weapon)