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Jyutping gaau3 dou6 so2
Pinyin jiào dǎo suǒ

Definitions (粵典–words.hk)
  1. 名詞、香港
    一種​懲教​設施​,​適用​於​14​至​20​歲​嘅​犯人​,​代替​監禁​刑罰
    training centre, an alternative to imprisonment for both male and female offenders aged from 14 to 20
Definitions (Wiktionary)
  1. noun
    correctional facility