Rotational symmetry of order 2.

Reflection symmetry about the perpendicular bisectors of the sides.

curved

A glide reflection is a combination of a reflection in a line and a translation along that line. This can be done in either order. A rotational transformation is a rotation around a fixed point or axis.

Reflection . . .

-- looking at yourself in a mirror

-- turning on the light in the room in order to see the floor

-- seeing the moon in the sky

Refraction . . .

-- putting on your glasses in order to see more clearly

-- the pencil looks like it's bent when you stick one end of it in water

-- the weather radar is aimed slightly UP in order to see a storm 100 miles away