Toyota Racing Development. Where there are now 3 words there used to be just one word in Toyota performance... Tosco.
This shirt features several parts from an early 70s Tosco brochure for TA22 Celica 1600GT road and rally racing parts. A picture of the poster I made from this brochure can be seen here.
The following comes from Brandsport's Site
Before becoming Toyota Racing Development, TRD was known as Toyota Sports Corner, or TOSCO. TOSCO was established in Yokohama and built Toyota's first performance engines for the Celica and Corolla, and provided the Japanese domestic market (JDM) with performance parts, allowing Toyota to compete against its rival, Datsun. However, to appeal to a wider market, in the mid-1970's TOSCO's name was changed to Toyota Racing Development and TRD parts began to make their way into the hands Toyota enthusiasts in the United States.