The term Spyder designates the car as a convertible. It's been used in Europe for a long time, although I'm not sure just how and/or why the word "spyder" was chosen for this application.
GT, which of course stands for Grand Touring, should describe a car such as the BMW 850i, the Mercedes SL600, or even the Jaguar XJ series. A true GT is not a true sports car, such as a Ferrari 360 Modena or even a classic MG, but rather a luxury/performance coupe. Generally a true sports car is geared more toward the real driving experience and as such often lacks many creature comforts.
And then there is the famed GTO, first used by Ferrari and shortly followed by Pontiac. Gran Tourismo Omologato (Italian for Grand Touring Homologation), it refers to the street legal group of vehicles that must be built and made available to the general public for purchase before its racing counterpart is allowed to compete in certain classes of, generally, sports car racing. Ferrari set out to build their 250 series of sports racers but needed to sell a certain number before they could compete. Hence the Ferrari 250GTO. I don't believe Pontiac ever needed to homologate their car, but rather just played on the name. Everybody needed to homologate thier cars for the TransAm racing series in the late 60s/early 70s so there were special versions of Mustangs, Camaros, Firebirds, Challengers, etc. Pontiac was the only maker to actually license the name "TransAm" for use on their Firebird, and payed a royalty to the series for many years.
And I see now that I've rambled a bit with way more info than you asked for!
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