A kind of Vidyā (occult science);
that Vidyā, through which one can get the desired answer (or solution) to one's question by incarnating the deity on clothes.
'pasiṇāiṃ' ti praśnavidyāḥ yakābhiḥ kṣaumakādiṣu devatāvatāraḥ kriyate.
(Sthā 10.116 Vṛ Pa 485)