The evolution of T - OnePlus' interim model for the fall that's neither quite the next generation, nor is it entirely the old one. It all started with the 3T, the T jokingly there to one-up Apple's S, and we're now a couple of Ts later at 6T.
Source: https://www.gsmarena.com/oneplus_6t_5t_3t_evolution-review-1861.php