The meaning of the acronym S.H.I.E.L.D. has changed throughout the years, holding various denotations. Among them being Supreme Headquarters International Espionage Law-Enforcement Division, Strategic Hazard Intervention Espionage Logistics Directorate, and Strategic Homeland Intervention Enforcement Logistics Division. Regardless, S.H.I.E.L.D. is a faction within the Marvel universe that acts as a secret intelligence and anti-crime organization.