A utility knife
Seems the culture for using a knife started atleast two and half million years ago and were made from a variety of metals i.e. copper, brass, iron, steel and ceramics.
Their uses included hunting, carving and eating. Knives were a tool as much as a utensil for eating.
As a utensil – the knife is quite useful but it was also a trap. During WWII, Americans could be discovered / uncovered because of the way they used the knife. Quite different from the Europeans’
From Dana Velden, author of thekitchn.com
There are two basic methods for eating with a knife and fork. The “American” involves having your fork in your left and your knife in your right when cutting your food, then putting the knife down and switching your fork to your right hand to eat, tines facing upwards. (If you’re right-handed, that is.) With the “European” method, the fork remains in the left hand and the knife helps coax your food onto your fork. The tines remain facing downwards.