Shree Shree Yantra Mercury - Shree Shree Mercury Tortoise Yantra, Itâ€™s also good for wealth and property and also success. Itâ€™s also known as kurm shree ynatra. The tortoise yantra is very power and effect fully as it is crafted on the back of a tortoise. The tortoise yantra is very helpful which one work in a competitive environment. The tortoise yantra also knows the god of all yantra.