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The Lexus model names seem more abitrary than they are acronyms. ES = Executive Sedan? LS = Luxury Sedan? SC = Sport Coupe or Sport Convertible? I suppose the "X" is supposed to mean 4-wheel drive. I dunno!
I can , however, give you the model names in Japan.
ES = Toyota Windom
IS = Toyota Altezza
GS = Toyota Aristo
LS = Toyota Celsior
SC = Toyota Soarer
RX = Toyota Harrier
LX = Toyota Land Cruiser Cygnus
(Our Land Cruiser is called the "Land Cruiser Amazon" in Japan)