The term functions as a noun phrase, with "enigma" serving as the core noun and "11 sep" acting as an adjectival modifier specifying the subject. An enigma is a puzzle, mystery, or inexplicable occurrence. Therefore, the phrase refers to the collection of unresolved questions, anomalies, and alternative theories surrounding the events of the September 11, 2001 attacks, which challenge the official consensus narrative.
This concept encompasses a range of specific points of contention that fuel skepticism and debate. Key among these are questions regarding the physics of the World Trade Center's structural collapses, particularly the speed and symmetry of the Twin Towers' fall and the collapse of World Trade Center 7, a building not struck by an aircraft. Further elements include inquiries into the timeline of the military and aviation response, the nature of the impact and resulting damage at the Pentagon, and unorthodox financial activities, such as alleged insider trading on airline stocks, prior to the attacks.
In application, the term serves as a framework for analyzing the events of that day not as a closed case but as a subject with significant aspects that remain, for some observers, inadequately explained. It is used to categorize and discuss evidence and hypotheses that deviate from the conclusions presented by official investigative bodies, such as the 9/11 Commission. The use of this phrase implies a perspective that the accepted historical record is incomplete or potentially flawed, warranting continued scrutiny and investigation into its puzzling components.
