The Norse god of war, identifiable with Tiu or Tiw.
"Odin was sometimes worshipped under the name Tyr, reflecting his identification as the Norse god of war known also as Tiu."
The word tyr comes from the Old Norse name for a god and entered English through the influence of Scandinavian settlers in Britain. It is related to other Germanic words that originally referred to this deity before evolving into terms like Tuesday.