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Transcript of The Invention of the Stop Sign. The Stop Sign Progress/Changes Made on the Stop Sign 1915 1925 1935 1945 1955 1965 1975 1915- A man named William Phelps Eno invented a white sign with black letters, in Detroit, Michigan. 1922- Realizing the stop sign was so important, an association was formed to make more stop signs.
Quick Answer. The Drexel University Math Forum advises that no one invented the radical sign as it exists today. Instead, it evolved over time, originating from a German symbol that resembled a check mark. The first known occurrence of that symbol was in the book Die Cross, published in 1525, by the German mathematician Christoff Rudolff.