This is an icon for an onion. The onion has layers and layers that is revealed. There appears to be five layers on the onion and on the outside of the onion there appears to be the root of the onion.
This Onion 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 6,000 icons, all in the same style and quality.