The concept of Yin and Yang has its roots in ancient Chinese
philosophy. The Yin-Yang is the most prominent Taoist symbol, also
often called the Taiji. The symbol is composed of an outer circle
enclosing 2 teardrop-shaped halves wrapped around each other. One half
is black with a small white dot at its center, and the other half is
white with a small black dot at its center.
The outer circle represents Tao, the source of all existence and that
which unifies all. The black half is the Yin-qi or the fundamental
feminine energy. The white half is the Yan-qi or the fundamental
masculine energy. The way they are wrapped around each other suggests a
fluid continuous movement or constant interplay which gives birth to
everything in the world as we know it. The Yin and Yang although polar
opposites constantly transform into one another; night becomes day and
day gives way to night; birth comes to death and death paves the way
for rebirth; hot grows cold and cold warms up to become hot.
The small white dots nestled within each half represent the seed of one
within the other, illustrating how they are never totally independent
from one another and how they cannot exist without the other.