Now you're back to using your personal definition, which isn't even supported by the dictionary definition you quoted!
Perhaps you can explain why, when the NCAA enacted its policy, nicknames, mascots and imagery were specifically identified? If images and mascots are the same thing, why did the NCAA bother to differentiate between them?
The answer is obvious to anyone who understands the accepted meanings of the words. Play all the semantics games you want, but you're wrong.