tatra niratisayam sarvajna bijam

God is the all knowing seed.

Yoga Sutras of Patanjali, 1.25

tatra = in that (god)
niratisayam = unsurpassed
sarva = all
jna = knowledge
bijam = seed

The circle with a dot inside is to represent the soul of god and the colours are to represent us as refracted rays of the white light of god.