Final answer:
The secondary member of the grid supporting a suspended ceiling system, usually carried by the main runners, is called a cross tee. This piece is essential for the stability and support of ceiling tiles within the grid framework.
Step-by-step explanation:
The subject of this question is related to engineering, specifically in the area of construction and building design. The component described is known as a cross tee, which is a secondary member of the grid used to support a suspended ceiling system. Cross tees are typically sheet metal tees that are carried by the main runners and are an integral part of the ceiling grid framework. They intersect with the main tees to form a sturdy support structure for ceiling tiles or panels. The other options listed include the main tee (the primary support that runs the length of the room), the perimeter angle (which is attached to the wall to support the edges of the ceiling grid), and the hanger wire (which is used to suspend the main tees from the overhead structure).