This circle icon is common in many applications and operating systems, and is usually used to indicate an important operation or function. For example, in the iPhone operating system, an application with a circle icon usually means that it is a running application; in the Windows operating system, a circle icon usually means that a file or folder is being encrypted or compressed, etc.
The circle icon is designed to make it more convenient and efficient for users to use an application or operating system. By using standardized circle icons, users can quickly identify and understand the meaning of the icons, and thus find the functions and operations they need more quickly.
With the continuous development of technology and changing application scenarios, the design of circle icons is also constantly evolving and developing. For example, in some emerging applications, designers change the color or size of circles to represent different functions and operations; and some designers have also begun to try to use three-dimensional effects to make icons more vivid and intuitive.