When Muslims say or write the name of Muhammad, they usually follow it with "Peace and Blessings be upon him" (Arabic: "sall-Allahu `alayhi wa sallam"). For example, "Muhammad (Peace and Blessings be upon him)". In printed matter, a calligraphic symbol is frequently used instead of printing the phrase. Sunnis believe that Abu Bakr succeeded Muhammad. Shias believe that Ali should have succeeded.