The term 'construction unit' refers to the components used in the construction of a building. These components include a SOCLE (5 letters), which is a base or foundation for a structure; an ibar (4 letters), which is a metal bar used to reinforce a structure; an ibeam (5 letters), which is a type of steel beam used to support a structure; and a buildingblock (13 letters), which is a large block of concrete used to form the walls of a structure.