Kṣipra (right hand)
Right hand — between thumb and index (snāyu-marma)
Kṣipra — 'swift' — between the thumb and index finger, in the first interosseous space. Snāyu-marma (ligament-class), kālāntara-prāṇa-hara: fatal after a delay if injured (Suśruta attributes the lethality to convulsive seizure following a wound here). The coordinate is approximate; the true location is on the dorsum of the hand at the interosseous space, not visible in the standard front-body silhouette.
Point 11 of 13 in Marma Points (Suśruta-saṃhitā)
Cross-tradition overlaps
No overlapping points are registered for this point.
Sources
Suśruta-saṃhitā, Śārīrasthāna 6 (primary_canonical)
Śārīrasthāna 6.16–23 (Acharya ed.) includes Kṣipra among the hand marmas and classifies it as a snāyu-marma with a kālāntara-prāṇa-hara prognosis, meaning fatality may follow after a delay.