The Edge has experimented some with strings over the years. In the 1980's and early 1990's, he seemed to favour ROTOSOUND
nickel composite strings. I've seen at least 2 separate adverts for Rotosound strings featuring The Edge in magazines
between 1984 & 1992. It seems that most sets were .11's but there may have been some experimentation with sizes
along the way.
Although, I do hope to get a chance to verify exact models and gauges in the near future.