The FBC Warning Sign is a medium-sized, rectangular metal plaque with sharp, clean edges, embodying the brutalist architecture aesthetic of the game. It features a matte black finish with bold, white stenciled letters spelling 'FBC WARNING' and a prominent triangular hazard symbol in bright yellow at the center. The surface is slightly weathered, showing minor scratches and dents to suggest age and use within the Federal Bureau of Control's surreal environment. The sign is mounted on a sturdy, minimalist metal frame, designed to stand out against the game's stark, concrete backdrops.