The Japanese Soil Knife or Hori Hori (translates to Diggy Diggy) It is just pretty bad ass!
I really don't like to have lots of tools around, but this one is my favorite. The stainless blade is perfect for cutting, digging, dividing, planting, weeding. ! no really if orcs attacked my farm this is the tool I would have in my hand. I take it foraging to dig tubers and have used it as a axe to make a quick shelter while island hopping on a canoe trip.