A bathroom thumb turn refers to a type of lock mechanism commonly found on bathroom doors. It's typically a small, cylindrical knob with a flat surface that can be turned using your thumb or fingers. This type of lock is installed on the inside of the bathroom door and is designed to provide privacy rather than security. When the thumb turn is rotated, it engages or disengages the door lock bolt, allowing the door to be locked or unlocked from the inside. This is often used in conjunction with a door handle on a rose, It's a convenient and simple solution for providing privacy in bathrooms without the need for a key.