It stands for "Everything happens for a reason". Being able to recognize that everything that happens is part of the plan for your life, that you can't control it, and that everything will work out is one of the most important parts of living a happy life. And sometimes ya just need a little reminder. :)
Ellipsis tattoo. "An ellipsis connects one idea to another grammatically, but has deeper meaning in life. An ellipsis could show a change in time or place, or even the slow change of a thought or idea. It reminds me that change can be, and ultimately is, a good thing."