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Knives, axes, scissors, and chisels. The forward edge of a crowbar is also a wedge.
two axles
An Axe when seen from top view, one can see that on one side it is thinner tending to be sharp and on the other end it is thicker thereby tending to have a wedge shape. When an Axe is stroked into the wood or in something else, its wedge shape makes it to penetrate in the surface due to pressure and area principle thereby making both the surface being apart.
Anything that isn't a wedge, really. An example of a wedge is an axe. A thing with that shape is a wedge. Non examples could be other simple machines: screws, levers, pulleys, really anything that, if you look in an encyclopedia, isn't classified as a wedge. :) .
A wedge is a thing that can be made of any material. Sometimes, wedges are used as a doorstop. An example of a wedge is a slice of cheese from a circle chunk of cheese or as I said a doorstop. I don't really know anything else about wedges... I hope this was somehow helpful...