The Meaning of Karuna
Karuna is a Sanskrit word and is used in Hinduism and Buddhism. It is translanted to mean any action that is taken to diminish the suffering of others and could also be translated as "compassionate action." When individuals experience enlightenment, they report that all beings are known as one. Therefore, it is natural to extend compassionate action or Karuna to everyone without distinction because we are all one. As we help others and aid them in their healing process, all beings benefit. Because of the oneness of all beings, it is understood that Karuna is not only extended to others out of love, but also because it is an entirely logical thing to do. In the same way that you would want to heal your own wounds, you would also want the wounds of others to heal. It is also stated in the Buddhist literature that Karuna must be accompanied by parjna or wisdom in order to have the right effect.
Karuna is the motivating quality of all enlightened beings who are working to end suffering on Earth. They continually send an unlimited amount of healing energy and guidance to us, but not all are receptive to it. As you develop Karuna in yourself, not only are you helping others, but you also become more receptive to the Karuna that is being sent by all enlightened beings. Thus your healing is quickened as well.
Karuna Reiki® opens you to work more closely with all enlightened beings. This includes those enlightened ones who are physically present as well as those in spirit.
The Karuna Reiki® Class
This class is for anyone who has had Reiki Master training. It is complete with two levels, two attunements, four master symbols and eight treatment symbols. We have experimented with and taught this system since 1994 and have found it to be effective and powerful. In fact, most students find it more powerful than Usui Reiki! The energy has a more definite feeling to it. It works on the emotional and spiritual levels and also can help one become more grounded. Those who receive the attunements report experiences with their guides, angels, and higher self and feel the healing presence of other enlightened beings.
A brief description of the four Karuna® I symbols is given here: The first symbol prepares the client for deep healing and is useful with past life issues. It helps release karma and deeply seated issues on the cellular level. The second symbol heals deeply and can be used to breakup the negative patterns we unconsciously use to insulate ourselves from the truth, thus shattering delusion and denial. It heals the shadow self. The third symbol fills the person with love and restores balance. The fourth symbol completes the treatment by bringing the client back into the body and grounding. The Karuna II symbols are of a higher vibration and more powerful. They help connect directly with the Higher Self and work on a deeper level. While they have specific purposes discussed in class, the experience of their energy allows intuitive guidance in their use.

Information from: William Rand, creator of Karuna Reiki healing modality.