Canonum De Ius Positivum
Canons of Positive Law
VII. Law
7.6 Creation of Law
Article 277 - Decree
Canon 3081 (link)
Only three (3) types of Official Person may issue a valid Decree, Supreme, Superior and Ordinary:
(i) A Decree Issued by a Supreme Official Person is called an Imperium when promulgated as an order or Edictum when promulgated as a deed; and
(ii) A Decree Issued by a Superior Official Person is called an Institutum when promulgated as an order and Consultum when promulgated as a deed; and
(iii) A Decree Issued by an Ordinary Official Person is called an Ordinatim when promulgated as an order and Decretum when promulgated as a deed.
Canon 3083 (link)