A rectangular, metal sign with sharp, angular edges, featuring a bold, black silhouette of a gas mask against a vibrant yellow background. The sign includes raised, embossed text reading 'ASPHYXIATION HAZARD' in a stark, sans-serif font, with additional smaller text detailing safety protocols. The metal surface has a slightly weathered texture, showing minor scratches and dents from environmental wear, while maintaining a matte finish to reduce glare in the dimly lit environments of the Federal Bureau of Control.