That doesn’t look like a word, so you might be misremembering the sequence. The more common Steel Mill broadcast cipher is:
Caesar or Vigenère variations:
to see where he was hiding during the events of Arkham City? batman arkham city decode broadcast 2-7-5 3-2-5
(a gadget also provided by the hostage) to reveal the location of the next victim. Arkham Wiki Comparison: Secret "Numbers Station" Easter Eggs That doesn’t look like a word, so you