The main point of the keyword term "11 sep in history" is the component "11 sep." Grammatically, this component functions as a proper noun. It is classified as a proper noun because it names a specific, unique entitya particular calendar date that has gained significant historical identity, often referring to the events of September 11, 2001.
In the complete phrase, "11 sep" acts as the head of a noun phrase. The subsequent prepositional phrase, "in history," functions as an adjectival phrase that post-modifies the noun. It provides context and specification, distinguishing this date by its historical importance. The entire construction "11 sep in history" can therefore act as a subject or object within a sentence, with the proper noun "11 sep" as its conceptual and grammatical core.
Identifying the main point as a proper noun is crucial for the article's focus. It dictates that the content must be centered on the specific events, entities, and concepts associated with that particular date. The article's purpose becomes to describe, define, and analyze the subject named by "11 sep," treating it as the central topic rather than as a temporal reference for another subject.
