This is a Pause 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 13,000 icons, all in the same style and quality.
There are two rectangles of equal length, width, and height. They both contain the same width outline. They are placed parallel to each other and are both pointed north-south or vertically, as opposed to horizontally.