What about X and E? (pronounced deck and ell) There are other symbols you could use instead of ASCII if you really wanted to distinguish them (like chi & epsi

What about X and E? (pronounced deck and ell) There are other symbols you could use instead of ASCII if you really wanted to distinguish them (like chi & epsilon). You can count to 10 with 5 fingers with not much practice (look up Chisanbop); I think most kids could pick up counting to 12 on their finger joints pretty quickly.