Torchwood is an anagram of Doctor Who, originally used as a code name
When Russell T. Davies was filming the first series of the revived Doctor Who in 2005, the anagram Torchwood was used to label the series tapes so that no information about their contents would leak out. When he was offered the opportunity to spin off a post-watershed series from the Who material, Davies was so fond of the anagram he decided to keep it.
