The National Marker Company sign is designed to instruct people to exit a facility through its lobby. It is often used to clearly communicate emergency exit procedure in commercial and public buildings. The bold and legible legend âEXIT THROUGH LOBBYâ is printed in contrasting colors to make the message easily visible even from a distance and in all lighting conditions. The rectangular sign is UV resistant, chemical resistant and graffiti proof. The sign has NMC Sign Muscle coating to protect the text and graphic against fading, scratches, scuffing, mold, and moisture.