Oh, not that U…
Panel 1: The inside of a car. Xi’s driving, Sigma is in the copilot seat and Rho is sitting in the back, barely fitting in the car because he’s too tall. Rho says “Wait, I think you have to take the U-turn…”. Xi raises her eyebrows and replies “The one over there?”
Panel 2: A close-up of Sigma with a blank expression. Rho says (off-panel), “Yeah, that one! The U-turn!!”
Panel 3: Same close-up of Sigma, but now he’s furrowing his brow in a concentrated expression. A thought bubble shows the Braille symbol for the letter “U”.