Constitutional references to God , also known as monotheism exist in the constitutions of a number of nations, most often in the preamble. A reference to God in a legal text is called invocatio dei ('invocation of God') if the text itself is proclaimed in the name of the deity. A reference to God in another context is called nominatio dei ('naming of God'). Such invocationes and nominationes dei are found notably in several European constitutional traditions (reflecting the strong position of established churches in those countries and the tradition of invoking God in legal documents) and in the constitutions of Islamic countries. Abrahamic monotheist religions are most often the source of such inclusions and additions.