Vyavartita: When fingers beginning with the last one (the little finger) are gradually pointing inwards at the time [the hand] moves round, the Karaṇa thus produced is called Vyavartita.
Vyāvartita: The fingers beginning with the little finger are moved inwards.
The hasta in prone position is moved from the sides to the chest while the fingers curl inwards following the little finger’s lead. This is vyāvartana as the erudite say.
When the fingers [of a hand] beginning with little finger are turned round inward one after another [and moved toward the chest], this action <karaṇa> is said to be vyāvartita.
In dvartita [vyavartita], the hand is moved around as in avestita,