"A device intended to provide visual information on safety warnings, e.g., biological, chemical, radioactive and/or other hazardous or potentially hazardous conditions within a healthcare facility. A sign will typically be manufactured using words, letters, symbols, and/or pictures to convey the information content (e.g., ""X-ray in use"", ""Radiation"", ""Isolation room"", ""Pressurized gas""). It is used throughout healthcare facilities to provide visual information on safety to staff, patients, and/or visitors."