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It means nothing. When they started up the Lexus line, Toyota chose to follow the "Letter-Letter-Displacement code" nomenclature started by Acura's alphanumeric names (hated by many at the time it started up).
The only thing worth knowing (until someone can quote/reference a Toyota executive explaining otherwise) is:
Altezza = IS
Windom = ES
Aristo = GS
Celsior = LS
Soarer = SC
Harrier = RX
Land Cruiser Prado = GX
Land Cruiser Cygnus = LX
Last edited by Slooooooow; Jun 26, 2008 at 10:32 AM.