same size
the image is of the same size as the object
upright
the image is upright
virtual
the image is virtual. a virtual image is formed inside the mirror and cannot be formed on a screen
laterally inverted
the image is laterally inverted. e.g. you raise your right hand, however the image will appear that your left hand is being raised.
equal distance
the distance between the image and the mirror is equal to the distance between the object and the mirror.