Idea of Concept Icon
This is a picture to represent "concept". This icon is made by starting with a square. Inside the square are two double sided arrows. One on the left hand side and one at the bottom. There is a light bulb in the image on the top right hand side boxed in by the arrows.
This Concept 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.