The north ecliptic pole (Běijí 北极; represented by a red dot which does not correspond to any astral body since the north ecliptic pole is starless, 無極 Wújí, "without pole") coiled by Draco (Tiānlóng 天龙), the Dragon, which slithers between the Little Dipper and the Big Dipper (Great Chariot), respectively representing yin and yang, death and life (Cheu, p. 19). As the symbol of the "protean" primordial power which embodies both yin and yang in unity (Pankenier, p. 55), the Dragon is the curved line in-between yin and yang in the "diagram of the Supreme Pole"  (太极图 Tàijítú, of 太极 Tàijí) → .
Source#1: Pankenier, David W. (2013). Astrology and Cosmology in Early China. Cambridge University Press. ISBN 1107006724. pp. 103–105.

Source#2: Cheu, Hock Tong (1988). The Nine Emperor Gods: A Study of Chinese Spirit-medium Cults. Time Books International. ISBN 9971653850.
Own work
Aethelwolf Emsworth.