Upside-Down Letter, Backwards Letter
The logical quantifiers ∀ and ∃ described plainly as an upside-down letter and a backwards letter.
Use this cartoon
Free for classrooms, worksheets, slides and other non-commercial use under CC BY-NC 4.0, with credit to Ben Orlin.
Cartoon by Ben Orlin, Math with Bad Drawings. https://cartoons.mathwithbaddrawings.com/2021-01-01-upside-down-letter-backwards-letter/ (CC BY-NC 4.0)Transcript
∀ (for every): "Upside-down letter," ∃ (there exists): "backwards letter." [A pondering figure]