There is no letter T in the word DEXRON. WTH is dextron? Some sort of 80's techno fluid?

Cope and his home built trans are pretty comical. Had a friend spec out a complete trans for a 10 second racecar. Burnt up in 2 days at the track. Cope was like, "Oh I had a bad run of valve bodies but thought I had those fixed". Gee thanks CRT!