A presidential decree is an official order or decision made by a president of a country. It holds legal authority and is used to enforce policies or make new laws without needing approval from other branches of government. Full definition
A new presidential decree was issued and is aimed to regulate all «electronic money» by the end of summer this year. (blokt.com)
1965 Presidential Decree of Blasphemy: I could not find the original full text of this decree, however it seems to be cited in multiple places and this site offers a paper containing excepts from it. (politics.stackexchange.com)
By law an economic embargo can be issued only by presidential decree if the national security of the United States is imminently threatened. (religion-online.org)