In Reiki, symbols are used as a focus tool to help direct healing energy. There are traditionally four main symbols in the Usui Reiki system. The Cho Ku Rei, or Power symbol, is used to increase the power of Reiki and focus it in a specific area. Sei Hei Ki, or the Harmony symbol, is used for emotional and mental healing. Hon Sha Ze Sho Nen, or the Distance symbol, allows for distant healing across space and time. Finally, Dai Ko Myo, the Master symbol, represents enlightenment and is typically only used by Reiki masters.