What do you call a 3D quadrilateral?

Confused!

No seriously, a quadrilateral is a plane figure that means it is a 2D shape (or polygon). It is created by intersecting 4 straight lines.

main quadrilaterals are parallelogram, rhombus, trapezium, rectangle, square, kite.

Quad derives from 4 and Lateral deriving from line - hence 4 lines. An alternative name is a quadrangle (4 angles).

3D shapes are created by joining plane polygons in 3 different planes i.e. 3 x 2D shape surfaces.