Idea of Feedback Icon
The icon is a picture of the logo for feedback. The icon is in the shape of a rectangle. The rectangle appears to be an open envelope, with some kind of document coming out of it. The document has an upward arrow in the center of it.
This Feedback 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.