Nomenclature - Glossary of Terms
A primary horizontal member used to support another beam, truss or rafter.
![Jack Beam](img/glos/05702057.png)
Vertical member at the side of a wall opening.
A cantilever boom or horizontal beam with a hoist and trolley.
![Jib Crane](img/glos/05802058.png)
A horizontal member for supporting the decking of floors or roofs.