The four heads of Brahma represents the four directions of the world and they also mean the four Vedas. The essence of all knowledge is hidden in the Vedas and they appeared from the four mouths of Brahma. Here is a look at the meaning and symbolism of the four heads of Brahma.
From the east head of Brahma appeared Rig Veda and Ayurveda. From south head of Brahma appeared Yajur Veda and Dhanur Veda. From the west head of Brahma appeared Sama Veda and Gandharva Veda. From the north head appeared Atharva Veda and Sthapatya Veda.
The east head of Brahma represents understanding especially the knowledge of the five elements. For example one has to understand what is water and why it is good for the body.
The south head of Brahma represents Karma or action. For example collecting water. Utilizing the five elements for the welfare of living beings.
The west head of Brahma represents enjoyment and contentment. We become content after drinking water. We enjoy a song or the playing of musical instrument.
The north head of Brahma represents how to make sure knowledge, karma, enjoyment and contentment are not lost. It teaches us ways to keep the various forms of five elements for posterity and protect them.