Why does the exclamation mark look like does today?

The modern exclamation mark evolved from a combination of the Latin Word "io," meaning "joy," which was abbreviated and stylized over time. In medieval manuscripts, scribes would sometimes write "io" in a stacked format, with the "i" above the "o," leading to the vertical line and dot we recognize today. The punctuation mark was officially adopted into grammar in the 15th century, solidifying its current appearance and use to indicate strong emotion or emphasis.