This is considered to be a very powerful and effective Navnath Sampradaya Yantra which is dedicated to Dattatreya. Dattatreya is the Guru of the Nath Sampradaya; he represents the Ever-Existent God who is the combination of Brahma, Vishnu and Mahesh.
This is a Sarva Karya Siddhi Yantra or a Yantra for all purposes. Keeping this Yantra on ones person, home or office is said to give effective benefits and the fulfillment of wishes, protection from evil energies and good health.
Sarva Karya Siddhi Yantra
You find the yantra on this link:
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http://www.prophet666.com/2011/12/sarva-karya-siddhi-yantra.html#ixzz1lCzQKHLr