three characteristics of space

This dharmadhatu space is described with three words corresponding to three ways of functioning: as "potential" in the context of sentient beings obscured by temporary stains, as "dharmakaya" in the context of buddhas who are free of stains, and as "suchness" from the aspect of pervading essence of both and being unchanging.

Here, the word "potential" (rigs) is also sometimes translated as "family" or "nature". It is synonymous with sugata essence, tathagata-garbha, and buddha nature. (EPK)

As is said:

Its nature is dharmakaya,
As well as suchness and potential. (The Light of Wisdom, Vol. 1, pg. 71).