Which of the following is not a type of playground surface?

In the context of playground surfaces, "composite" is not recognized as a standard category. The commonly accepted types include unitary, loose-fill, and rubber surfaces.

Unitary surfaces refer to those that are solid and continuous, such as tiles or poured-in-place materials, providing a smooth and stable area for play. Loose-fill surfaces are made up of materials like wood chips, sand, or gravel, which can provide cushioning but require periodic maintenance to keep the depth consistent. Rubber surfaces are designed to be resilient and safe, often coming in mats or as poured materials, offering a durable and shock-absorbing playground area.

Since "composite" does not denote an established category for playground surfaces, it stands out as the correct answer in this context. Understanding the characteristics and classifications of playground surfaces is crucial for recreation facility management, as the choice of surface impacts safety, maintenance, and user experience.