As the only true Wisdom is in knowing we know nothing, I saw no better comic representative for this than the Wizard of Oz’s Scarecrow with No Brain (Socrates is only funny in Bill and Ted’s Excellent Adventure)..
My ASL Dictionary has a comic of the Scarecrow showing the ASL hand sign for KNOW.
Fingertips of Bent hand tap the side of the forehead for the knowledge in the head
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