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 is a Pull Down icon. We've made it in iOS style
, first introduced in iOS version 7 and supported in all later releases up until now (at least iOS 11). This style is based on thin two-pixel lines and is optimized for 50x50 px. Unlike other vector icon packs that have merely hundreds of icons, this icon pack contains 13,300 icons, all in the same style and quality.