BAK-4 prisms are the best; they are made of superior optical glass that produces clearer images. BAK-4 prisms show a truer round, which translates to better light transmission and edge-to-edge sharpness.
These are what you want in your binoculars.
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It depends on the prism. Is it a triangular prism, a rectangular prism, a pentagonal prism... etc..
Triangular Prism Rectangular Prism Polygonal Prism Hexagonal Prism
an oblique prism is slanted and a regular prism is not, its right.
A rectangular prism has 6 faces while a hexagonal prism has 8 faces.
The length of the prism is at right angles to the bases.