The sign of the number pi is made up of black digits on the background of a row of gray digitsThe sign of the number Pi is made up of black digits on the background of a row of gray digits
On a black background, a large blurred circle of blue colorOn a black background, a large blurred circle of blue color
Anime character in red with bright flashes on a black backgroundAnime character in red with bright flashes on a black background
Отличительный знак на какой-н. вещи.