Uttara Ashadha is the twenty-first, ruled by the Sun, its symbol a tusk (also the back legs of a bed), its deity the Viśvedevāḥ — the all-gods, the assembled company. The name means 'the later, the invincible'.
Mechanically the Sun gives light that is continuous rather than glaring; the Viśvedevāḥ give agreement from everyone. The tusk is an exact image: it grows extremely slowly, and once grown it doesn't break. This segment's victories are that kind — not seized but grown, and so not taken back. The tradition holds it right for starting what's meant to last a lifetime.
Where you'll recognise it: strong endurance, clear principles, winning in the second half, care about legitimacy (an unclean win sits badly with you), most vulnerable when you rush the result, and routinely underestimated before you overtake. Running well, you're the most enduring: doing long things, building what can be handed on, winning people's genuine consent. Stuck, you're hard and slow — refusing to adjust, principle stiffened into rigidity, or missing the moment because winning the right way mattered more. Purva Ashadha before it rises; Shravana after it is the ear: once grown, the next thing is learning to listen.