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 is a Dumbbell icon. We've made it in iOS style
, first introduced in iOS version 7 and supported in all later releases up until now (at least iOS 11). This style is based on thin two-pixel lines and is optimized for 50x50 px. Unlike other vector icon packs that have merely hundreds of icons, this icon pack contains 13,700 icons, all in the same style and quality.