These are usually "trim levels" and are not similar for different makes. The VTi sold here in Asia is labelled as the GLi in Australia and LX in the US/Can. "X" usually (not always) denotes a base trim such as X,DX, LX, .EX, DLX(Deluxe) usually denotes a base model with minor accessories, like power windows, velour and such. GL (Grand Luxury) SE (Super Executive) come chok-a-block with everything on offer, and then some for a particular model. In Addition to GL, We have GT (Grand Touring/Gran Turismo in Italian) which is actually a proper vehicle classifcation.