I am new to blender (about a week working after work). And I face this problem that I have this plus sign in yellow circle. And I am not sure how to get rid of it. I have no idea what is the name of it (if I would know name I probably would google it). This happens in edit mode.
Check your Tools panel, on the left of your 3D View (displayed with T), you must have activated the Extrusion tool, select another one if you want. To use the Extrusion tool, you can either click on it on the Tools panel, or activate it with the shortcut E, in that case you won't see the yellow point.