There is a small splotchy object that resembles a virus or some sort of infectious agent. There is one diagonal line going through the middle of the virus, implying it's crossed out or killed.
This is a Virus Free 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 13,100 icons, all in the same style and quality.