ABC is an elevation logo, which can correspond to the plane when drawing the elevation; Cross diagonal rectangles generally represent high cabinets, and single diagonal rectangles generally represent low cabinets.

Drawings are graphic expressions, indicating the details needed for construction, such as size, direction and technical parameters, as well as the physical objects that the owner wants to build. It contains two meanings, which are included in the contract as the work of drawing; Supplementary and modified drawings issued by the owner (or his representative) according to the contract. 1999 The definition of drawings in the contract model published does not include the drawings provided by the contractor.

Technical documents describing the structure, shape, size and other requirements of engineering buildings, machinery and equipment. Use numbers and words to indicate dimensions. Another interpretation: refers to the medium that records graphic characters. Besides paper drawings, there are also electronic drawings.