See TiN entry. GTL Gunning Transceiver Logic. This page from TI . GTO Name of a Pontiac muscle car popular in the 1960's. The Beach Boys recorded a popular song celebrating it.
Song is in the time signature of five speeds.
Also a designation on racing Ferraris, but that probably has nothing to do. GTO Gate-Triggered Oscillator. Here's almost a tutorial from Westcode . GTO Gate Turn-Off. GTO Gaussian-Type Orbitals.