Final answer:
A wood framing member used to support floors or roof sheeting is called a joist, which is distinct from rafters, studs, and trusses that serve other structural purposes.
Step-by-step explanation:
A wood framing member used to support floors or roof sheeting is known as a joist. Joists are the horizontal structural elements that are used to span an open space, often between beams that subsequently transfer loads to vertical members. When used in floors, joists are laid out in repetitive patterns, providing support for the decking or floor surface. On the other hand, a rafter is also a type of framing member, but it is used in the construction of a roof, supporting the roof deck and associated loads. A stud is a vertical framing member in wall construction. Finally, a truss is a rigid structure formed of relatively slender pieces, often used as a major support in buildings, forming the framework of a roof.