WHAT IS SRI YANTRA
The Sri Yantra also known as the Sri Chakra represents all the fundamental principals of Tantric philosophy. It is known as the best or supreme existing yantra and all other yantras derive from it.

The place of the mother goddess is represented by the dot or bindu in the centre of the design. The dot has four legs
Brahma – the creator is in the northeast.
Vishnu – the preserver is in the southeast.
Rudra – for withdrawal is in the southwest.
Sadasiva – for retention is in the northwest.