That largest Skandha (aggregate of Paramāṇus (the ultimate atoms)) of the Pudgala (physical substance), which occupies the entire cosmic space and which consists of greatest number of Paramāṇus and is Catuḥsparśī (possessed of four (fundamental) touches).
ayameva sarvotkṛṣtaparamāṇusaṃkhyāpracito... eṣa punaracittamahāskandho yasmāccatuḥsparśa iṣyate.
(ViBhā 644,646 MaVṛ p.282,283)