In the UKicon these things are known as Chads

"The RAF Cranwell Apprentices Association says that the image came from a diagram of how to approximate a square wave using sine waves, also at RAF Yatesbury and with an instructor named Chadwick, and was initially called Domie or Doomie,[25] the latter name also being noted by Life as used by the RAF.[20] As alternatives to Chatterton or Mr Chadwick as the origin of the name Chad, REME claimed that the name came from their training school, nicknamed "Chad's Temple", the RAF claimed it arose from Chadwick House at a Lancashire radio school, and the Desert Rats claimed it came from an officer in El Alamein.[20]"

So I shall be expecting a licence fee from all you Chad alias Kilroy users!

Patrick
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