Concentration without applied thought or sustained thought (Buddhism)

This is unification in the three jhanas, commencing with the second in the fourfold reckoning and the third in the fivefold reckoning.

According to Hinayana Buddhism, concentration is considered as of one kind (monad), of two kinds (dyads), of three kinds (triads), of four kinds (tetrads) or of five kinds (pentad). In the second triad, this is the third concentration.