Noun
pentacube (plural pentacubes)
(mathematics) A polycube composed of five cubes
A pentacube puzzle or 3D pentomino puzzle, amounts to filling a 3-dimensional box with the 12 flat pentacubes, i.e. cover it without overlap and without gaps. Source: Internet
Filling boxes A pentacube is a polycube of five cubes. Source: Internet
Since each pentacube has a volume of 5 unit cubes, the box must have a volume of 60 units. Source: Internet