The FBC Infectious Sign is a stark, rectangular metal plaque with sharp, clean edges, embodying the brutalist architecture of the game. Its surface is a matte black with raised, slightly weathered white lettering that reads 'INFECTIOUS - KEEP OUT', featuring a biohazard symbol at the center. The sign is mounted with heavy-duty bolts, suggesting it's meant to be permanent and authoritative. The design is minimalist yet ominous, with no decorative elements beyond the functional warning.