Wikipedia
Matsyendrāsana
Matsyendrasana is an asana. It is translated as Lord of the Fishes Pose from Sanskrit.
The name of this pose comes from "Matsyendra" referring to a Hindu sage, and "asana" meaning "posture" or "seat".
The half-variation of Matsyendrasana is Ardha Matsyendrasana. Matsyendrasana as a full expression of the pose is performed with legs in full lotus position.
Matsyendrasana is also known as Purna Matsyendrasana, meaning "full" or "complete" lord of the fishes pose.