Transforms suddenly have rotations

I'm making a 2D game and up until now all transforms only had Position and Scale in the inspector, and in the scene view it would only show a red and green arrow and the little blue square. All of a sudden every transform also has a rotation and in the scene view every object has 2 big circles around them. I have no idea how I turned this on and would like to turn the rotations back off, does anyone know how this could have happened?