The keyword phrase "11 of sep" functions grammatically as a proper noun phrase. It is a specific name for a unique entity: the calendar date of September 11th. The phrase is composed of a cardinal number ("11"), a preposition ("of"), and an abbreviation of a proper noun ("sep" for September). Combined, these elements operate as a single nominal unit to identify a precise day, similar to how "Fourth of July" names a specific holiday.
As a proper noun, this phrase transcends its literal meaning as a simple date. It has become a specific designator for the historical events of September 11, 2001, particularly the terrorist attacks in the United States. The phrase acts as a shorthand, where the date itself is the name for the event and its associated consequences. This semantic shift is crucial; the phrase does not refer to the eleventh day of September in any given year but specifically to the events of 2001 and their ongoing legacy.
Understanding this phrase as a proper noun is fundamental for its application in an article. It dictates that the phrase should be treated as the name of a subject, concept, or event. For analytical or writing purposes, this means the focus is not on the attributes of a date but on the specific historical, political, and cultural significance tied to that name. This classification ensures that any discussion or analysis correctly interprets the keyword as a reference to a defining event rather than a simple temporal marker.
