In general, if rectangular in profile: a wedge, slope, or ramp.
At the hardware store, it may also be called a shim or a door shim.
If circular in profile, it might be called a cone if the thin end is infinitesimal in diameter, or it may be a frustum if the narrow end has some dimension.
In a machine shop, it might also be a taper or a Morse taper, if referring to certain tooling.
A Wedge
A is a wedge.
If the object is of the same width and tapers from thick to thin, it may be a wedge.
The definition of wedge is a piece of wood, metal or other material having one thick end that tapers into a thinner edge and is used for driving between two objects.
The Galaxy Note Edge is a great device. The device has many great reviews.
deltoids
convex lens
edge
Flip flop is edge triggered device
The Edge Evolution Programmer is a device that provides information about your vehicle's performance. This device is designed to fit onto your vehicle like it was custom made for it.
Small = 1.5 inches from centre to edge. Large = 2.5 inches from centre to edge. Flamer template = 8 inches long, over the 8 inches it tapers out to a 2 inch (edge to edge) circle the end of the circle being the end of the 8 inches.
The literary device in this sentence is personification. This is because it attributes human traits, such as visibility, to the "east edge of the earth."