The origin of the terms uppercase and lowercase might seem pretty self-explanatory. Upper and lower must be references to the height of the letters, and the use of case is presumably an offshoot o ...

But with road signs, the priority is to comprehend what you’re seeing from as far away as possible—and a mix of uppercase and lowercase letters is better at accomplishing that than all caps.

32 control codes (mainly to do with printing) 32 punctuation codes, symbols, and space 26 upper case letters 26 lower case letters numeric digits 0-9 We tend to say that the letter ‘A’ is the ...