The times they are a-changin’.
This post seems to be older than 16 years—a long time on the internet. It might be outdated.
From The Word Origin Calendar for Tuesday, January 16, 2007:
?: The question mark was first used, in its present form, in the 16th century England. It is a simplification of an abbreviation in which an uppercase Q stood atop a lowercase o, representing the Latin word quaestio, “I search for.”
And as Bill Nye used to say: Now you know!
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