The term "911 Targa" functions as a proper noun. It is the specific, capitalized name of a particular model of automobile produced by Porsche. This grammatical classification identifies the subject not as a general category but as a singular, unique entity.
In this compound term, the numerical designator "911" acts as a proper adjective or an attributive noun, modifying the head noun "Targa." The noun "Targa" refers to a specific semi-convertible car body style characterized by a fixed roll hoop and a removable roof section. The combination of the model series identifier ("911") and the body style name ("Targa") creates a complete and unambiguous product name, a common convention in industrial nomenclature.
Recognizing "911 Targa" as a proper noun is fundamentally important for the article's focus. This directs the content to be about a specific product with its own history, design, and engineering, rather than a general discussion of targa-style roofs or the entire 911 model line. This classification ensures precision and establishes a clear, narrowly-defined subject for analysis.