- If you mean a vehicle, the first vehicle that was referred to as a "quad" was the Kawasaki KLT200, introduced in 1984. It was a three-wheeled ATV (All-Terrain Vehicle), but the term "quad" was sometimes used to refer to it despite it not having four wheels. True four-wheeled ATVs were introduced later.
- If you mean a type of computer processor, the first quad-core processor was released in 2005. It was the AMD Opteron processor, which featured four processing cores on a single chip.
- If you mean a group of four people or things, the term "quad" is not particularly historical and has been used for various purposes.
Without further context, it's difficult to pinpoint the "first quad" in a precise sense.
