Which symbol is the shutter?

Shutters are usually represented by the symbol S in photography, which stands for speed. Shutter is the key part of the camera, which is responsible for controlling the time when light shines on the photosensitive element. The shutter determines the time and duration of light entering the camera. In mobile phone photography, the shutter symbol is also often represented by S, that is, the part that the user touches on the screen to capture the image.