There is evidence that Takata declined to allow her students to record either the Reiki symbols or names with all information being passed verbally. Over the course of many generations of teachings, quite a few different sets of symbols were derived as well as spellings for the different symbol names. Many of the more advanced Teaching Reiki Masters tend to look at these squabbles and smile, as they have come to a realization that the energy is self correcting and will work as long as the intent is sincere. Some teachers incorporate their own life-style philosophies or their healing modalities into their teaching, often without telling the student what they are doing. Some have created or adopted new symbols and mantras.
Some Internet sites publish symbols and attunement methods.
In the process of bringing an already changed version of Usui's method to the West Takata made further changes in order to make the system acceptable to a nominally Christian people. The symbols passed on by Usui started off in life as part of Buddhist ritual. Their adoption took on the aspects the symbol had in its original context. Usui had created a set of affirmations that were used by his group. For today only, do not anger, do not worry.