老冧 [－－]

Jyutping lou5 nam1
Pinyin lǎo lín

Definitions (CC-CANTO)
  1. number (of a prisoner / policeman) [colloquial]
Definitions (粵典–words.hk)
  1. 名詞、俚語、舊式
    冧​把​；​差​人​同埋​囚犯​嘅​編​號
    number, e.g police number, prisoner's number; literally, old number