The dantian are fields where the elixir is cultivated, usually three: in the lower abdomen, the chest and the head. The lower dantian, below the navel, is the centre of breath and qi in meditation, martial arts and qigong.
Dantian
Elixir field: the centres in the body, especially below the navel, where vital energy is gathered in Daoist practice.
Also: tan tien, cinnabar field