Example
Look behind you
uoy bniʜɘd ʞoo⅃
How it works
Letters are swapped for characters that look horizontally flipped, and the order is reversed. Symmetrical letters such as A, H, O, and x stay the same. Unicode doesn’t have a flipped version of every letter, so some are close approximations.
Mirror writing in history
Leonardo da Vinci famously wrote most of his notebooks in mirror script, from right to left. Mirror writing is also why ambulances have “ƎƆNA⅃UᗺMA” printed on the front: drivers see it the right way round in their rear-view mirror. Today it’s mostly used for puzzles, escape-room clues, and playful posts.