That is or has been poised (in various senses of the verb).

literal. Poised; so arranged, placed, or adjusted with a counterpoise, as to remain in equilibrium.

Poised or balanced unaided or without external support. Also (later chiefly) figurative: in command of oneself; self-possessed, self-assured…

Sustained or maintained without external assistance; self-sufficient, independent; (also) characterized by such a quality. Also of a physical object…

Held up without attachment; held aloft.

(a) standing alone; not attached or connected to another structure; not supported by a structural framework; (b) figurative independent or…

That is able to stand by itself (literally or figuratively); standing or existing independently, without outside assistance.