Purva Bhadrapada is the twenty-fifth, ruled by Jupiter, its symbol fire in a dark place (also a funeral pyre, also the front legs of a bed), its deity Aja Ekapāda — 'the unborn one-footed', an old Vedic figure linked to fire, lightning and Shiva.
Mechanically Jupiter is meaning and expansion; Aja Ekapāda is the fire that stands up out of the ground. Together: burning for something larger. This segment's intensity isn't temper, it's passion that has found an object beyond itself — an ideal, a faith, an art, a truth. The single foot describes the method: one point of support, so it stands at an extreme, and imbalance is its characteristic rather than its defect.
Where you'll recognise it: extremely high temperature when committed, no patience for worldly moderation, interest in the mystical and the outer edge, conversation that suddenly goes deep, people beside you not always able to take the heat, and possibly one burnt-out trough behind you. Running well, you're the most contagious: setting people alight, spending yourself on an ideal, seeing levels others can't. Stuck, the fire runs loose — heedless, extremity mistaken for sincerity, or entirely hollow after the burn. Shatabhisha before it shuts the door; Uttara Bhadrapada after it is the still serpent in deep water: after the fire, the quiet that settles to the bottom.