This is a Zoom In Filled 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 12,500 icons, all in the same style and quality.
The icon is a magnifying class with a cross, or plus sign in the middle of the lens. The lens is the largest part of the icon, and the handle faces downward and to the right at a 45 degree angle from the lens.