Idea of Info Popup Icon
This icon for info popup is depicted as a square. At the bottom of the square in its center there is a small protrusion outward ending in a sharp point. At the top of the square is a line running horizontal across it. In the center of the square is a large lower case letter i.
This page shows the different variations of the Info Popup from an Icons8 icon pack. Feel free to resize and recolor the icon, and then download the icon in PNG format for free.