Idea of Shuffle Icon
It's a very common symbol used to symbolize when you want to shuffle through a few items. It has two arrows which start at both the bottom and top, interwine in the middle and then end at the opposite place (top/bottom). Both arrows point to the right.
This Shuffle 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 6,100 icons, all in the same style and quality.