There is an outline of a man in the center of the image. To the right and slightly above the man's head there is a question mark symbol hanging in the air.
This Inquiry 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 5,700 icons, all in the same style and quality.