This is a percentage sign. There is a circle on the left that is slightly higher than the circle on the right. In between is a forward slash dividing them. This is the same symbol you would see to distinguish 1% or 2% Milk
This Percentage 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.