The Dharma Wheel is one of the oldest symbols of Buddhism. Just as the Cross represents Christianity or the Star of David represents Judaism, the Dharma Wheel represents Buddhism worldwide.
The circular shape of the Wheel represents the perfection of the Dharma or the teachings of the Buddha. The eight spokes of the Wheel represent the Eightfold Path used to achieve spiritual enlightenment and end suffering. The three swirls in the hub represent the three expressions of an awakened mind: Buddha, Dharma and Sangha, they are referred to as the Three Jewels.
The color of Deep Blue in Buddhism represents tranquility, ascension, purity, healing and the infinite. The Buddha of medicine or healing is known as the ‘Blue Buddha’ and is dark blue in color. Overall this color represents Wisdom.