Idea of Decrease Icon
The image signifies a graph. There are several vertical parallel lines of varying heights. Along the top edge of these, a jagged arrow follows along their peaks, showing their declining values.
This Decrease icon is made in Material Design style
developed by Google. This style is based on extremely simplified shapes, thin two-pixel lines, and is optimized for 24x24 px. Unlike other vector icon packs that have merely hundreds of icons, this icon pack contains 6,200 icons, all in the same style and quality.