This Tłok 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 4,300 icons, all in the same style and quality.
This logo represents a piston and is made up of a rectangle with a short half circle on top with a smaller circle in the middle of the rectangle. There is a swinging shape underneath and connected to the rectangle with a circle inside of it.