An element that enables a sea dependent nation to project its political, economic, and military strengths seaward is known as?

The term that identifies an element allowing a sea-dependent nation to project its political, economic, and military strengths seaward is referred to as sea power. Sea power encompasses the capability of a country to utilize its naval forces to achieve strategic objectives and influence international relations through control of maritime routes, protection of commercial interests, and assertion of military presence. This concept is pivotal for nations whose economies and security depend on maritime activities and trade.

While the other terms may relate to maritime or naval activities, they do not specifically encapsulate the comprehensive effect of a nation's ability to exert influence and maintain a strategic advantage through the use of its naval capabilities in the context of its political, economic, and military presence on the seas. Sea power gives a holistic view of the interplay between a nation’s maritime forces and its broader national interests.