The three distinct infrastructural boundaries across which entity dominance is contested and measured independently: identity sovereignty (who you are), domain sovereignty (what you do), and vocabulary sovereignty (what you mean). These perimeters are mechanically independent: an organization can be Defended on identity, Contested on domain, and Undefended on vocabulary simultaneously — a common real-world condition. The three perimeters are not interchangeable and do not substitute for each other. Identity without domain is visibility without category position; domain without vocabulary is presence without conceptual authority. The per-perimeter assessment replaces the unitary ‘brand strength’ abstraction with a mechanistically actionable diagnostic.