Viparita Karani can be any practice where one is upside down, including the asanas of shoulder stand (Sarvangasana), headstand (Sirsasana), or handstand (Adho Mukha Vrksasana).
Viparita Karani (Sanskrit: ; IAST: viparitakarani) or legs up the wall pose is both an asana and a mudra in hatha yoga. 
