One (sometimes two) symbol is added at the Master level. When the student reaches the Master level they are granted the privilege of teaching and passing attunements to students.
This level is often achieved after much practice.
There is also a Reiki III which is basically the Master level, but for those that have no intention of teaching. Given the overlap, we will not cover it.
If you are interested in becoming a Reiki Master, this is something we will do together and will include practice sessions together. Reach out to me and we can develop a plan for you.