A gesture made with the index finger and pinkie raised, using the thumb to hold the middle and ring finger down, like this: 🤘.
Known in the West as "the sign of the horns", "the devil's horns", or "throwing the horns". Often associated with heavy metal music.
Not to be confused with \m/, which is used when the thumb is out, instead of holding down the middle and ring fingers. Neither to be confused with the fox shadow puppet, where the thumb and index and middle fingers are extended forward to meet and form the shape of a fox's muzzle.