Idea of Joining Queue Icon
The icon is shaped like three identical silhouettes of humans the top of their heads to their shoulders. The first silhouette has a arrow above it pointing down. The other two are partially hidden behind the silhouette in front of them and the trail off to the right side.
This Joining Queue 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.