Idea of Pull Down Icon
There are 3 lines that run horizontal stacked on top of each other equally spaced. Below the bottom line, also equally spaced and centered is a small triangle with its point facing down.
This Pull Down 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.