This is a circle. Inside of the circle are two curved lines with the ends facing up representing closed eyes. Underneath the eyes is a closed mouth with full lips.
This Kiss 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.