The document discusses occupational safety and health (OSH) signs and symbols in the workplace. It describes common OSH signs used to indicate hazards, including danger signs displayed in red that warn of risks of serious injury or death. Caution signs in yellow alert people to potential minor injuries. Safety signs consist of words, pictorial symbols, and messages to clearly communicate hazards and safety information using standardized colors and meanings. Matching exercises help readers identify different types of safety signs and their purposes.