It's a small letter y by itself placed in the center of a square. The square has slightly rounded corners. There is only white space between the y and the square.
This Y Coordinate icon is part of an icon pack of 100,000 web icons. Icons are available in PNG, SVG, CSS, PDF, and EPS formats, as a font, and in other vector formats. Unlike other icon packs, our web icons are designed by a single designer, guaranteeing the consistent style and quality.