It is simply called its top.
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A triangular prism that is sitting on one of its rectangular faces MUST have a slanted top!
There is no limit to the number of cubes which can be arranged on top of a rectangular prism.
none apexes are only for pyramids (the point at the top) there are no apexes in a rectangular prism
It is called a cuboid.
A rectangular prism with 6 congruent faces is called a cube.