Small Size/Shape for Tight Area Weeding; ideal for weeding those troublesome weeds that like to grow right next to your plants, where a regular hoe would damage your plants.  Some 50 years ago my dad took a regular hoe to a blacksmith who ground it down to this shape for doing close up weeding next to plants; I inherited it however, rust and handle wear have made it time for a replacement.  (I now use some lubricant spray on my tools to help avoid rust/etc.)