Scott Fahlman first suggested the use of the colon with the left parenthesis to iconically represent a frowning face on the internet in what has become a well-known emoticon.
Scott Fahlman (born 1948), computer scientist and credited creator of the emoticon
He is notable for early work on automated planning in a blocks world, on semantic networks, on neural networks (and, in particular, the cascade correlation algorithm), on the Dylan programming language, and on Common Lisp (in particular CMU Common Lisp).
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