Whatever thing created NaN
From UnAnything Wiki
Whatever thing created NaN was around at the very beginning of the computer. It was a being of neutrality. It created NaN before dissolving into plotholium mist. According to time-travelers, it looked like a combination of Steve Jobs, Bill Gates, and a biblically-accurate angel. It was created when Asploded Tinky Winky asploded, shooting whatever value WaNEDMAsplodePlotholium had back to the stone age, and when it was read NaN was the result.