Cube
There is no 3D shape with 6 faces: 4 rectangles and 2 triangles. See the link for all forms of hexahedra.
it is called a triangular prism
Oh, dude, it's like a no-brainer. That shape you're talking about is a rectangular prism. It's got six faces, and each face is a rectangle. So, yeah, it's like a fancy way of saying a box.
Many 3d shapes have a corner.
Cube
cone
A cuboid.
Cuboid.
A butt
cube
Cuboid
A triangular pyramid.
a hexagonal prism
Squares, rectangles, and the rhombus.
A square based prism.
A cuboid.