The ankh is an ancient Egyptian symbol that represents eternal life, spiritual immortality, and the union of opposites. Spiritually, it embodies the life force and the interconnectedness of the physical and spiritual realms. The loop at the top signifies the soul or the eternal aspect of life, while the crossbar and stem represent the material plane and the union of male and female energies. The ankh is often seen as a key to higher knowledge and spiritual enlightenment, symbolizing the balance and harmony between life, death, and the afterlife.