Answer: The Exclamation Mark
The exclamation mark was introduced in the 15th century by printers looking for a way to mark a feeling of wonderment, admiration or exclamation with a punctuation mark. It is believed that the stamp itself comes from the Latin io which was an exclamation of joy. Over time, the "i" was placed over the "o", the "o" was scaled down, and as the printers took over the symbol, they simply stylized the shape of the symbol. Since then, the brand has remained in continuous operation, but with different meaning and use differences. Despite its long history of use, the exclamation mark did not receive a dedicated key until a century after the introduction of the typewriter.
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Bonus Keyboard Trivia: Other characters historically assigned the cold shoulder of typewriter designers include the numbers one and zero. Early typists used the lowercase letters L and uppercase letters O to denote 1 and 0.