In American Championship Car Racing, “Indy Car” is a descriptive name for a type of open wheel car that has participated in the Indianapolis 500-Mile Race. Originally, the machines were generally referred to as “Championship Cars,” or the more ambiguous term of “Big Cars.” Both terms were used to differentiate the machines from lower-level, similar-looking open-wheeled cars of the time such as sprints and midgets. However, as the result of the genre’s fundamental link to the Indianapolis 500-Mile Race, many people started to use the Indy Car name in order to differentiate the Indianapolis-style open-wheel cars from other open-wheel cars, such as Formula One cars.

Reference: Wikipedia

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