If Assyria had a logo, it was the lamassu—a colossal hybrid: bull's body, eagle's wings, human head (usually bearded, horned crown). Not decorative. Apotropaic—magically protective.
Flanking every major palace and temple gateway: Nimrud, Nineveh, Khorsabad, Ashur. Pairs faced outward, warding off evil—demons, enemies, chaos itself. Some weighed 30+ tons; moving them required engineered sledges, rollers, and hundreds of laborers (depicted in reliefs).
Lamassu appeared on cylinder seals, ivory plaques, and bronze bands. The concept spread: Persian palaces (Persepolis) adopted them; Hittite and Urartian gates echoed them. In modern times, the lamassu became an Assyrian nationalist symbol—and a target (ISIS destroyed the Mosul Museum lamassu in 2015; a replica now stands in Trafalgar Square).
The lamassu wasn't art for art's sake. It was theological infrastructure—a statement that the king's threshold was guarded by divine order. Cross it with ill intent, and the bull-man sees you.