This is two letter Ts. The first one is a capital letter, it's a horizontal line intersecting a vertical line, with empty space between the lines of the letter. The second letter is next to the first. It is shorter than the first by a third. It's a horizontal line intersecting a vertical with empty space in the lines of the letter.
Related to Lowercase Icon
Related icons are the icons with matching tags, as well as all editing icons. All icons are in the same flat style. You can either download free PNG icons or buy SVG vectors