Cho Ku Rei Reiki Power Symbol (CKR) Sounds like: cho koo ray …cho like choke, Ku like coo coo clock, Rei like ray of sun. Cho Ku Rei has lots of other names that helps describe what it “does”. The Power Symbol. The Focus Symbol. Symbol of Protection. The Light Switch. CKR is the first of the Reiki symbols. It is used to increase the power of Reiki and to focus on a specific location. It is used to “place the power here”.