工字鐵 [－－铁]

Jyutping gung1 zi6 tit3
Pinyin gōng zì tiě

Definitions (粵典–words.hk)
  1. 名詞
    橫​截面​呈​「​工​」​字​嘅​鋼​鐵
    I-beam
Definitions (Wiktionary)
  1. noun
    I-beam