Idea of Virus Free Icon
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 Virus Free icon is made in Material Design style
developed by Google. This style is based on extremely simplified shapes, thin two-pixel lines, and is optimized for 24x24 px. Unlike other vector icon packs that have merely hundreds of icons, this icon pack contains 6,200 icons, all in the same style and quality.