Cube
There is no 3D shape with 6 faces: 4 rectangles and 2 triangles. See the link for all forms of hexahedra.
A box is a 3D shape with 6 rectangles (a box could also include squares). The rectangles are: Top/Bottom/Front/Back/Side/Side
it is called a triangular prism
Many 3d shapes have a corner.
Cube
cone
A cuboid.
Cuboid.
A butt
Cuboid
cube
A triangular pyramid.
a hexagonal prism
Squares, rectangles, and the rhombus.
A square based prism.
A cuboid.