For those who can’t read this, here’s what the shirt says:
Intelligence is the ability to adapt to change – Stephen Hawking
For those who argue reading symbols is not a useful skill, this can be one way to send coded messages in certain situations where numbers are needed. This can also help when someone is captured behind enemy lines and English isn’t their first language.
This is the more traditional setup for boy/girl scouts.
This is a more detailed explanation of the origins of codes.
For those who still debate against this method of communication, a soldier during Vietnam used Morse code with his eye lids to say “send help.”