Which of the following is NOT generally considered a type of sign?

The selection of building codes as the correct answer is appropriate because building codes are regulatory standards that govern the design, construction, and occupancy of buildings and structures to ensure safety and compliance with local requirements. They are not classified as signs, which are typically visual graphics intended to convey information to the public or individuals within that space.

On the other hand, ground signs, neon signs, and safety signs are all recognized categories of signage. Ground signs refer to signs that are supported by a pole or base and placed on the ground, often used for advertising or information purposes. Neon signs are illuminated signs made with gas-filled tubes that emit light, commonly used for commercial advertising. Safety signs are used to provide guidance or warning about hazards, ensuring safety protocols are communicated effectively.

Thus, building codes do not fit into the category of signs, making it the correct answer to the question.