The term "911 Turbo S" functions grammatically as a proper noun. It is a specific name for a particular product, in this case, a model of automobile manufactured by Porsche.
A proper noun names a unique entity, and while this term is composed of multiple words and a number, the entire phrase operates as a single, indivisible naming unit. In this context, "911" is the model series, "Turbo" designates the engine technology and performance tier, and "S" signifies a higher-specification variant. These components collectively form a single proper name, similar to how "Statue of Liberty" or "Ford Mustang GT" are treated as single proper nouns, not a sequence of separate nouns and adjectives.
For the purpose of article construction, this classification is critical. As a proper noun, "911 Turbo S" will primarily function as the subject or object within a sentence. For example, it can be the subject performing an action ("The 911 Turbo S accelerates rapidly.") or the object receiving an action ("He purchased a 911 Turbo S."). It does not act as an adjective to modify another noun, nor does it function as a verb. Understanding this ensures the term is used with grammatical precision throughout the text.
