How is 'Natraj asana' commonly known in English?

'Natraj asana' is commonly known in English as the Dancer Pose. This pose is characterized by a graceful one-legged balance where one leg is lifted behind while the same-side hand holds the foot, creating a shape that resembles a dancer in motion.

The name 'Natraj' refers to Lord Shiva in his form as the cosmic dancer, which reflects the beauty, elegance, and control required to perform the pose. The pose not only enhances balance and flexibility but also symbolizes the connection between body and spirit, mirroring the expressive qualities of dance.

The other choices refer to different yoga poses and do not align with the characteristics or name of 'Natraj asana'. For instance, Tree Pose is a different balancing pose that focuses on standing on one leg with the other foot placed against the inner thigh or calf. Circular Pose and Warrior Pose also represent distinct shapes and postural alignments that do not involve the aspects of grace and dynamic motion associated with the Dancer Pose.