"an anchor with a dolphin coiled around it"

Aldus symbol
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Italian Aldus Manutius (1449-1515) was an extremely important figure in shaping modern publishing and the modern language. It was he who invented italic type; he also formalised the modern use of the semicolon. His books bore the dolphin and anchor logo which is sometimes used today by the modern publishing company Doubleday.

However, he apparently had no idea what a dolphin looked like. Nobody's perfect.