When I was first learned Reiki, I was taught that drawing the power symbol (CKR) one way did one thing, and drawing it another way did something else. Then I read that Mrs. Takata, whom I like to refer to as "The Mother of Reiki", taught the opposite of what I was taught. I am very big on experimentation, so I started playing with the symbols and discovered that Mrs. Takata had it right.
I am talking about the difference between drawing the power symbol either CW (clockwise) or CCW (counter clockwise) and getting different results. One way (CCW per Mrs.T) powers up the energy or focuses it more intently sort of like a laser would, while the CW power symbol draws out negative energy from the area you are using it in.
I have instructed my students and members of my Reiki Facebook Group (REIKI FOR YOU AND ME) to start experimenting also and see what they found.
Yesterday at a Reiki Share, I had my students play around with the CCW CKR and they also found that it indeed got things really hopping!
If you are Usui Reiki Level II and above, I suggest you do your own experimenting and see what you get. Some people believe that it's all about intention anyway, but I personally feel there is always a right way and wrong way to everything.