On Samsung devices, the symbol may appear to be a smaller circle in the center of a larger circle. In either case, the sign shows up to tell the user that Focus mode has been activated.

Android phones are incredibly high-tech, with a number of symbols and icons displaying performance-related settings for battery use, Wi-Fi, and more.

The power symbol is expressed in several ways, but most people are likely familiar with the circle that has a line extending from its center, breaking its border to the top.

Three symbols were adopted for power, including the familiar one, the aforementioned enclosed circle, and the waning crescent Moon for sleep. The IEEE standardized these in IEEE Standard 1621.