Wallpaper abstract black background and bright colorsWallpaper abstract black background and bright colors
Abstract purple background with a writhing snake lineAbstract purple background with a writhing snake line
Blurred glowing outline of a fish on a dark blue backgroundBlurred glowing outline of a fish on a dark blue background
A lot of rectangular shapes in a funnel on a dark backgroundA lot of rectangular shapes in a funnel on a dark background
В математике: всякая непрямая линия. Кривая линия, изображающая рост или падение чего-н. в развитии какого-н. процесса.