There is a figure that looks like a light bulb. two parallel lines both extend outward before wrapping around to form a partial circle. within it is a Y shape. A diagonal line is drawn through the bulb shape
This No Idea 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 5,500 icons, all in the same style and quality.