This is an arrow pointing up and left (or -45 degrees if up is 0 degrees). It's a basic line going from the bottom-right to the upper-left and then an arrowhead on that line continue to point to the upper-left.
This Up Left 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 5,900 icons, all in the same style and quality.