The keyword term is a compound noun. In this grammatical structure, "combo" functions as the head noun, which is specified or modified by the preceding attributive noun, "11 sep." The entire phrase operates as a single conceptual unit, referring to a specific entity or concept.
This classification is based on the syntactic relationship between the two components. "11 sep," a proper noun denoting a specific date, is not acting as a standalone adjective but as a noun adjunct. It provides essential context, defining the type of "combo" being discussed. The meaning is derived from the fusion of the two words into a single term, where the first noun restricts the meaning of the second. This structure is common in English for creating precise, technical, or specialized terminology.
Understanding this term as a noun is crucial for its use as the article's main point. As a noun, it can function as the subject of a sentence, a direct object, or an object of a preposition. This allows for the construction of clear, focused statements and analysis directly centered on the concept it represents, ensuring grammatical coherence and thematic consistency throughout the text.