A half moon tattoo is an ancient symbol that primarily symbolizes balance and harmony. It also has deeper spiritual and religious meanings such as the cycle of life and completion. Some may believe that the placement of the moon reflects one’s journey to enlightenment and completion. In some cultures, the moon is also associated with fertility and abundance. Thus, the half moon tattoo can signify the completion of a certain process or cycle, or simply remind those who possess it of their overall commitment to balance and harmony in life.