What are Yantras ?

Yantras are considered the deity's body, with Mantras as the soul. Each deity has an associated Yantra, and Agamas give specific instructions for creating and worshipping these Yantras. They can be made on various materials, including gold, silver, copper, or Bhurja (birch bark). There are two types of Yantras: those used in worship (Pujaniya) and those worn on the body (Dharaniya), with the latter believed to fulfill desires and offer protection.

Three meanings words

1.Abhidha - literal meaning. A stone means a piece of rock. 2.Lakshana - secondary meaning. The word stone can be used to indicate hardness. 3.Vyanjana - suggestive meaning. The word stone can be used to indicate the merciless nature of someone.