Source:http://linkedlifedata.com/resource/umls/id/C0220913
UMD: Boards, placards or other written or image displays used for identification, direction, warning or other information of general concern. Signs are used in health care facilities to identify laboratories, offices, patient rooms, and other areas; to give visual directions to staff, patients, and visitors; or to warn from biological, chemical, radioactive, and/or other hazardous or potentially hazardous conditions.