A small
river near
Dallas (
Texas).
John Carmack from
id Software, (based at that time in
Mesquite, near
Dallas) named a new
3D engine after it, following the tradition of others companies whose businesses have to do with computers:
Intel did that with the
Mercedes and
Katmai processors, too.
The river Trinity is still there. Trinity as a ground breaking new engine died to give pass to the Quake 2 engine. Some of the features that originally had to go with Trinity are now found in Quake Arena 3.