Meaning
A small full-body mouse in profile with a long thin tail, usually grey or white. It means the tiny rodent itself, closer to a pet or field mouse than to the bigger rat 🐀.
It is used for being quiet as a mouse, cat-and-mouse chases with 🐈, pet mice and, jokingly, computer mice. Example: “Tiptoed past the sleeping baby like a mouse 🐁”.