The symbol was made out of the two Ts rotated.
It sends a message of power and resembles the black and white racing flags.
Since GTT is now a Seat and Cupra authorised dealer,
the symbol can commercially be used in two ways:
the silver outline in the front for Seat or the copper outline for Cupra.
You can see all three proposals below,
they picked the second one and I'm pretty happy they did:
1.
2.
3.
Thanks for watching! :D