jñeyāvaraṇa: Knowable-hindrance. Only a Buddha can overcome this, in addition to overcoming the defilement-hindrance (kleśāvaraṇa). When it is overcome, a Buddha is perfectly omniscient, capable of knowing both the intrinsic (svalakṣaṇa) and common characteristics (sāmānya-lakṣaṇa) of all things.

Sarvastivada Abhidharma, Sanskrit-English Glossary, by Bhikkhu KL Dhammajoti