Asana, Pranayama, Mudra and Bandha.: 1
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The Vajra mudrā "thunder gesture" is the gesture of knowledge.  An example of the application of the Vajra mudrā is the seventh technique (out of nine) of the Nine Syllable Seals. Mudra is used in the iconography of Hindu and Buddhist art of the Indian subcontinent and described in the scriptures, such as Nātyaśāstra, which lists 24 asaṁyuta ("separated", meaning "one-hand") and 13 saṁyuta ("joined", meaning "two-hand") mudras. Mudra positions are usually formed by both the hand and the fingers. Along with āsanas ("seated postures"), they are employed statically in the meditation and dynamically in the Nāṭya practice of Hinduism.
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Stutley, Margaret (2003) . The Illustrated Dictionary of Hindu Iconography (First Indianed.). New Delhi: Munshiram Manoharlal Publishers. ISBN 81-215-1087-2.This mudra is used in representations of Gautama Buddha and Amitābha. Sometimes the dhyāna mudrā is used in certain representations of Bhaiṣajyaguru as the "Medicine Buddha", with a medicine bowl placed on the hands. It originated in India most likely in Gandhāra and in China during the Northern Wei. There are numerous hand gesture mudras in yoga. Each of the hand gestures is based on the concept of the five elements as they relate to one's fingers. This article is about the use of mudra in Indic religion. For other uses, see Mudra (disambiguation). A 10th century Chola dynasty bronze sculpture of the Hindu god Nataraja ( Shiva) posing various mudras Indian Buddha Shakyamuni statue making the bhūmisparśa or "earth witness" mudra, c. 850 12th-century Japanese scroll showing different mudra gestures
Mudras And Prana The 7 Basic Mudras To Balance The Chakras And Chakras Mudras And Prana The 7 Basic Mudras To Balance The
a b Saraswati, Satyananda (1997). Asana Pranayama Mudrā Bandha. Munger, Bihar India: Bihar Yoga Bharti. p.422. ISBN 81-86336-04-4. In Indian classical dance and derived dances (such as Khmer, Thai or Balinese),  the term "Hasta Mudra" is used. The Natya Shastra describes 24 mudras, while the Abhinaya Darpana of Nandikeshvara gives 28.  In all their forms of Indian classical dance, the mudras are similar, though the names and uses vary. There are 28 (or 32) root mudras in Bharatanatyam, 24 in Kathakali and 20 in Odissi. These root mudras are combined in different ways, like one hand, two hands, arm movements, body and facial expressions. In Kathakali, which has the greatest number of combinations, the vocabulary adds up to c. 900. Sanyukta mudras use both hands and asanyukta mudras use one hand.  In Thai dances, there are 9 mudras.
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https://www.google.co.in/books/edition/Mudras_of_Yoga/NacaAwAAQBAJ?hl=en&gbpv=1&dq=chin+mudra&printsec=frontcover K. Rangaraja Iyengar: The World of Mudras/Health Related and other Mudras. Sapna Book house, 2007. ISBN 9788128006975.