Here’s a set of arrow shaped callouts in two varieties within one font. The black-on-white letters are on the upper case keys, and the white-on-black characters are on the lower case keys. The numerals 1 thru 10 in black-on-white are in the standard key positions, while the white-on-black numbers are on the same keys when engaging the “shift” key. The 'zero' key houses the number '10'. For a more dynamic look, the font is also available in an oblique version.