I am not even sure what to call it. The model was not created by me, but I wanted to mess with it. It came in OBJ and I went through and combined it all together. After messing in the menus I discovered this under object data. I clicked this, and now the rest of the mesh is gone, and I don't know how to bring it back.
As mentioned in the comments the OBJ mesh I imported had several "parts". What I did was when I went into object data I was viewing the old parts from the original mesh I imported. So I deleted the original mesh with so many "parts". Afterwards the only things I seen in mesh data were my object, and my floor plane. I selected my object, and it reappeared.