A type of Matijñāna (perceptual cognition); memory of the past life (or lives); through it, one can know one's own past nine lives which were in the species of Samanaska (i.e., beings possessed of mental faculty).
idaṃ jātismaraṇaṃ matijnānasyaiva ekah prakāro'sti. anena utkarsataḥ pūrvavarttīni navasamjnijanmāni jnātuṃ śakyāni.
(ABhā p. 22)
'sarati' tti smarati paurāṇikī jātiṃ - janma.
(U 19.8 ŚāVṛ Pa 452)