| 52 / | HD | STATIC STRUCTURES (E.G., BUILDINGS) |
| 633 | DF | OPENWORK; E.G., TRUSS, TRELLIS, GRILLE, SCREEN, FRAME, OR REBAR CHAIR {12} |
| 690 | DF | .~ Side-by-side terminus shafts; e.g., truss {4} |
| 693 | DF | .~.~ Diagonal bracing {2} |
| 695 | | .~.~.~ X-braced; i.e., connectors crossing |