Idea of Reply All Arrow Icon
The image is a double arrow that's pointing to the left. One arrow covers most of the other one. The points of the arrows are straight to the left but the tail curves up from below then turns to the left.
This Reply All Arrow 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 6,200 icons, all in the same style and quality.