Which wing shape is characterized by a high sweep and almost straight trailing edge?

The wing shape characterized by a high sweep and almost straight trailing edge is the delta wing. This design features a triangular shape, with the leading edge swept back significantly, which contributes to high-speed performance and stability at those speeds. The almost straight trailing edge helps to maintain a stable airflow over the wing at various angles of attack, enhancing its aerodynamic efficiency. Delta wings are particularly effective in supersonic flight, as they can handle the shock waves that occur at these speeds, leading to improved performance in high-speed aircraft.

The other options do not match the characteristics described in the question. A straight wing has minimal sweep and is typically used for slower aircraft. The truss wing doesn't refer to a specific shape in terms of aerodynamic design, but rather describes a support structure. A monocoque wing is also not defined by a specific shape but refers to a construction technique where the outer skin supports the load, which could be blended with various wing shapes. Thus, the distinct features of the delta wing align precisely with the question's criteria.