What type of shape represents friendly units frame shapes?

The rectangle is the shape that best represents friendly unit frame shapes due to its balanced and structured design, which can symbolize stability and cohesion—qualities often associated with teamwork and collaboration within military units. Rectangles are commonly used in diagrams and models to illustrate organizational structures and relationships, making them effective in visualizing how different units can interact harmoniously. This choice aligns with the principles of unit cohesion and support, where each "side" of the rectangle can represent different elements of a unit working together toward a common goal. Overall, the rectangle embodies the essence of friendly units, emphasizing partnership and support in operations.