First in the “Triforce of …” series, based on the Goddess of the Triforce series (this one’s less girly).
The text on the shirt says:
“tryfors ke ubela”
Which translates to Triforce of Power.
Din’s symbol is also cut out of the top piece of the Triforce.
*"tryfors" is the Hylian spelling of Triforce. It keeps the pronunciation intact.
Learn more about The Hylian Language Project