The five ultimate existents- The Astikāyas (extended substances) viz., Dharmāstikāya (medium of motion), Adhartnāstikāya (medium of rest), Akāśāstikāya (space). Pudgalāstikāya (physical order of existence), Jīvāstikāya (soul)-these five real substances which are eternal and are in the form of the aggregates of Pradeśas (the indivisible units of the substance) or Paramāṇus (the ultimate atoms).
paṃcatthikāe na kayāi nāsī, na kayāi natthi, na kayāi na bhavissai. bhuviṃ ca, bhavai ya, bhavi- ssai ya. dhuve niyae sāsae akkhae avvae avaṭṭhie nicce.
(Nandī 126)