Yup definitely a symbol from Reiki. And yes, it is Cho Ku Rei.
Here's some info on it from Essential Reiki: >The first symbol is Cho-Ku-Rei, the use of which is to increase power. In Reiki it is known as "the light switch". I referred to Reiki earlier as electricity. The light is switched on when you put your hands down to heal. When you add the Cho-Ku-Rei, the light is bossted from a fifty watt bulb to five hundred watts.
It basically goes on to say that using this symbol boosts your own energy several times, using various analogies.
Although I don't neccessarily say you need to shop here, this ladies work rocked my world, and also gave me excellent visuals to show students. https://ssl207.chi.us.securedata.net/barbarabrennan.com/merchantmanager/product_info.php?products_id=1 https://ssl207.chi.us.securedata.net/barbarabrennan.com/merchantmanager/product_info.php?products_id=3 Both of those are excellent reads for light workers / healers. I can also recomend this one - http://www.amazon.com/Essential-Reiki-Complete-Ancient-Healing/dp/0895947366. I have a few other books that may help but those are the ones that most of my friends look at and say "can I borrow this?". I can't condone anything illegal, but you may try searching a few torrent sites with these ISBN's. You never know what people are sharing now days. But eventually you are going to want your own copies. Because, yeah, they're good. :)