In Reiki, symbols are sacred and powerful tools used to enhance the flow and focus of Reiki energy. They are traditionally taught and passed down from Reiki Master to student during Reiki attunements. The use of symbols in Reiki practice can deepen the connection to the healing energy and assist in specific healing intentions. Here are the three main symbols commonly used in Usui Reiki:

1. **Cho Ku Rei (Power Symbol):** Cho Ku Rei is the most widely recognized Reiki symbol. Its purpose is to amplify and enhance the flow of Reiki energy. It is often used at the beginning of a Reiki session to bring in the energy and activate the healing process. The symbol is drawn with a vertical line through a spiral-like symbol.

2. **Sei Hei Ki (Harmony Symbol):** Sei Hei Ki is known as the symbol of harmony and balance. It is primarily used for emotional and mental healing. It can help release emotional blockages, promote inner peace, and bring emotional stability. The symbol is drawn with three vertical lines crossing a horizontal line.

3. **Hon Sha Ze Sho Nen (Distance Symbol):** Hon Sha Ze Sho Nen is the symbol used for distant or remote healing. It allows Reiki energy to transcend time and space, making it possible to send healing energy to someone who is not physically present. The symbol is drawn with a series of connected symbols that resemble a square.

It’s important to note that the power and effectiveness of symbols in Reiki practice come from the intention and the connection the practitioner has with the symbols. The symbols themselves hold no innate power but serve as tools to focus and amplify the healing energy.

It is customary for Reiki practitioners to respect the sacredness of these symbols by keeping them private and only sharing them with those who have received proper Reiki attunements and training.