What does RSX and TL stand for?

they are just names given to the car. no specific meaning other than vehicle identification.

I dont think those letters really mean anything.. They're just used to name the cars here in North America. There's the "SX" series, with NSX, RSX, TSX and CSX.. And there's the "L" series, including TL, CL, RL and EL.

Actually these cars have different names outside of North America... I know the RSX is called an Integra in Japan.