T/A stands for Trans-Am. The race circuit back in the 70's was called Trans-Am....that's how the car got it's name.
R/T stands for Road & Track
SRT8 stands for Street Racing Technology with an 8 cylinder motor
2010 Challenger SRT 8 Auto - Bright Silver
WebElectric Sequential Tail Lights, BT Catch Can, Silver Amber Bulbs, RPI Stealth Splash Guards, Interior Trim Welt
2003 F-150 SVT Lightning - Black (the fastest)