If you need help placing the Chinese Dynasties in the correct historical context, here are a few items that might help.
The chart above was found here.
The Gesture Warding off Evil (Tarjani Mudra) with forefinger and little finger outstretched.
The Gesture of Prayer (Namaskara Mudra) with the palms folded together.
The Gesture Beyond Misery (Buddha-Shramana Mudra) also called an ascetic’s Gesture of Renunciation.
The Gesture of Warding off Evil (Bhutadamara Mudra) this is a protection gesture