It is an icon depicting a male user. There is the outline of a man's head, neck and shoulders with an arrow encased in a circle to the right.
This Apply 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.