Tic Tac Toe!! :) LOL, or better known as the pound sign.
I was behind an older lady in the grocery store a couple days ago and she told me about her granddaughter who could not tell what time it was on the watch she was wearing but needed to look for her phone to get the digital time. I'm afraid to think it but, these are our doctors, lawyers and presidents when we all get too old to do anything. Scary!!