This is a Uninstalling Updates 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 12,600 icons, all in the same style and quality.
The image is a horizontal line that curves up and both ends then stops. It looks like a long letter U. Centered above the line is an arrow. The arrow is vertical and points straight up with the base near the line but not touching it.