It is a logo of a dumbbell. It has one bar with four weights. Two weights on each side. The two inner weights are the largest and the outer weights are slightly smaller. The bar and weights have square corners.
This Dumbbell 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.