Unilateral hearing loss (UHL) means that hearing is normal in one ear but there is hearing loss in the other ear. The hearing loss can range from mild to very severe. Parents or caregivers of children with UHL may ask:
The mirror doesn't flip left and right; it flips forward and back. Your front is farther north than your back, but your reflection's front is farther south than its back. Your feet and the reflection's feet both face down. The wrist with the watch is on the west side, both for you and your reflection.
Instead of a mirror line, we have a glide line, or, a line that marks the path of a translation. Glide lines can run vertically, horizontally, or diagonally. Mirror reflection is a special case of glide reflection. Mirror reflection is glide reflection with zero glide, as translation is a special case of rotation. Thus, the four symmetry operations are reduced to two operations--rotation and glide reflection.