The “symbol of the Greatest Name should not be used on gravestones” - 15 March 1975

Although there exists an instruction that the symbol of the Greatest Name should not be used on gravestones, no instruction has been found prohibiting the use of the symbol of the Greatest Name on any other particular item, such as jewelry, books or pamphlets. However, the Greatest Name should not be used in an undignified manner. Nothing has been found which would prohibit a believer from manufacturing and selling items using the Greatest Name provided that the manner in which the Greatest Name is used is dignified.  

- The Universal House of Justice  (From a letter dated March 25, 1975; compilation: Developing Distinctive Baha’i Communities, NSA of USA, 1998 edition)