3 ms·We don't even know why Ken Thompson chose ! for negation, and he is alive.by kazinator 2y agoWe don't even know why Ken Thompson chose ! for negation, and he is alive.arresin 2y agoIn my mind it’s always “not!”Joker_vD 2y agoPresumably because it looks like "¬": that sign used to have very long vertical stroke, like "|" does.