It's a logo to represent a nerd. It is an emoji face with a curved downward mouth to indicate deep thought or sadness. The face has no nose and glasses with only the frames showing.
This Nerd icon is made in flat color style
. This format was developed by Icons8 designer team and became immensely popular for use in web and mobile applications. Feel free to download this icon in PNG format for free, or unlock other formats for $5. Unlike other icon packs that have merely hundreds of icons, this monster icon pack contains 6,200 icons, all in the same style and quality.