It is called an octahedron.
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An 8 sided box is a Octagon.
Eight sided shape is called octagon.
An octagon and a quadrilateral, respectively.
Its called an octahedron. See the related link for more information
An octagon is an 8 sided 2 dimensional shape. A cylinder with the base of a hexagon (6 sided shape) would be an 8 sided 3 dimensional shape.