The "five" in the five aggregates

[Dogen]

Also, I was just rereading Bhante’s exquisite research into sakkāya, and perhaps astikāya might be relevant:

On sakkāya, identity, and substantial reality

Students of Buddhism are familiar with the term sakkāya, the view of which is one of the fetters binding us to suffering. I have previously translated it as “identity”, but in his most recent work, the translation of the Suttanipāta, Ven Bodhi says: Sakkāya: the composite of the five aggregates subject to clinging. A translation of the word is almost impossible. My past attempts, as “personality” and “identity,” are inadequate. Sakkāya is a compound of sat = “existent” and kāya = “body,” but…

He links this:

Astikaya, Asti-kaya, Astikāya: 8 definitions

Astikāya (अस्तिकाय) refers to an “aggregate of pradeśas”, as occurring in the Anekāntajayapatākā-prakaraṇa, a Śvetāmbara Jain philosophical work written by Haribhadra Sūri.—[Cf. Vol. I, P. 370, l. 23]—‘Astikāya’ is usually interpreted as an aggregate of pradeśas. All the dravyas except time are so designated, and hence their number is five according to the Śvetāmbaras and the Digambaras as well.

The five astikāyas are:

jīva-astikāya,
dharma-astikāya,
adharma-astikāya,
ākāśa-astikāya and
pudgala-astikāya.