"Jones had already concluded the Germans used code names which were too descriptive. He asked a specialist in the German language and literature at Bletchley Park about the word Wotan. The specialist realised Wotan referred to Wōden and might therefore be a single beam navigation system."
See also https://en.wikipedia.org/wiki/Battle_of_the_Beams#X-Ger.C3.A...
"Jones had already concluded the Germans used code names which were too descriptive. He asked a specialist in the German language and literature at Bletchley Park about the word Wotan. The specialist realised Wotan referred to Wōden and might therefore be a single beam navigation system."