Symbols
All reiki symbols give intention to the universe’s life energy. Cho Ku Rei turns on the energy, Sei He Ki is for mental or emotional healing, Zonar is use for past life and karmic issues, and Raku is for grounding.
Likewise, you can use other symbols that you are comfortable with to flavor the intention of the energy. These symbols can be ones that you are already comfortable with or symbols that would work well with a particular client. These additional symbols can be found in a variety of religions or in nature.