This is the symbol for the Indigo Tribe from D.C. Comics, who are similar to the Green Lanterns. The Green Lanterns gain their power by the emotion of will while the Indigo Tribe gains their power from compassion. From what I understand D.C. Comics cannot copyright this symbol because it is too simple but as lawyers are not known for their compassion, I will state that I recreated the symbol from the Indigo Tribe in D.C. Comics that D.C. Comics owns and has trademark to entirely in GIMP and vectorized it in Inkscape. This is far more accurate to the original symbol than the one that is floating all over the web that started on DeviantArt. This is my work but do whatever you want with it. This is a symbol of compassion, after all.
Own work
OneOfTheIndigoTribe