MIL-STD-14A, MILITARY STANDARD: ARCHITECTURAL SYMBOLS (23 MAY 1949) [SUPERSEDES JAN-STD-14] [NO S/S DOCUMENT]., This standard establishes a listing of architectural symbols that shall be use din the preparation of architectural working drawings. The symbols are those most commonly employed. Additional symbols may be used wherever necessary, and the listed symbols may be modified to fit specific structural conditions.