Watches + Dictionary = Watchionary
Illustration of the Crown
The little knob that can be seen on a watch's side is known as the watch crown. It can perform a number of tasks, such as winding a mechanical (manually wound) watch or pausing a battery-operated watch to conserve power. Additionally, it may be used to set or modify a watch's time, date and day. The crowns of water-resistant watches are often screwed into the casing.