Hastabhedah is defined to be of two varieties—non-combined or single-hand gestures called Asamyuta Hasta Mudras, and combined or double-hand gestures called Samyuta Hasta Mudras. Samyuta Hasta mudras are expressions performed using both hands together. According to the Abhinaya Darpana, there are 23 (sometimes considered 24) Samyukta Hasta mudras.

Samyukta Hasta Sloka

"Anjalishcha Kapothashcha Karkata Swasthikasthathaa Dolahastha Pushpaputaha Utsangah Shivalingakaha Katakavardhanashchaiva Kartari Swasthikasthathaa Shakatam Shanka Chakrecha Samputa Paasha keelakau Matsya Kurmo Varaahashcha Garudo Nagabandhakaha Khatwaa Berundakakyescha Ithyethe Sankhyaatha Samyukta Karaaha"

Types of Samyukta Hastas

Anjali: Hold Pataka in both hands and join the palms together.
Kapotha Hasta: Join only the borders of the hands, keeping inner palms slightly apart.
Karkata Hasta: Interlock the fingers of both hands.
Swastika Hasta: Cross both Pataka hands at the wrists.
Dola Hasta: Stretch Pataka hands downward along the hip line.
Pushpaputa Hasta: Join both Sarpasheersha hands at the wrists.
Utsanga Hasta: Cross Mrugasheersha hands and place on opposite shoulders.
Shivalinga Hasta: Place Shikhara (right) over Ardhachandra (left).
Katakavardhana Hasta: Cross Katakamukha hands at the wrists.
Kartareeswastika Hasta: Cross Kartareemukha hands at the wrists.
Shakata Hasta: Form using Bhramara or crossed Arala hastas.
Shankha Hasta: Form a conch shape using both hands.
Chakra Hasta: Place Ardhachandra hands like a plus sign.
Samputa Hasta: Cup both hands and place one above the other.
Paasha Hasta: Join bent index fingers like a chain.
Keelaka Hasta: Join hands with bent little fingers.
Matsya Hasta: Place hands together with thumbs stretched like fins.
Koorma Hasta: Modify Chakra by stretching thumb and little fingers.
Varaha Hasta: Place Mrugasheersha hands one above the other.
Garuda Hasta: Join Ardhachandra hands with thumbs interlocked.
Nagabandha Hasta: Cross Sarpasheersha hands at the wrists.
Khatva Hasta: Place Chatura hands with index fingers pointing down.
Bherundha Hasta: Cross Kapitha hands at the wrists.
Avahittha Hasta: Cross Alapadma hands near the chest.

Conclusion

Samyukta Hastas are an essential aspect of Bharatanatyam, using both hands to express meanings, emotions, and storytelling. Rooted in the Abhinaya Darpana, they form a rich visual language that enhances the beauty of classical Indian dance.