Dreaming about the yin yang symbol indicates that the dreamer is using his intellect to differentiate between opposites, which are united in a common destiny. The two halves contradicts itself to represent progression, change in opposites, may be indicative of the uncertainties you might be feeling about your career or future.
Yin yang in a dream signifies developing in one direction, then changes internally in a different direction. It is your internal struggle between balancing two different sides.