It's the 2-word title for the head of a parliamentary government
The title "president" is sometimes used 
by extension for leaders of other ... 2 Titles for non-heads of state .... Once the 
United States adopted the title of "President" for its republican Head of State, 
many... [DOC] [TLE] Head of state - Wikipedia [PAR] The role of a head of state in this regard, is codified in the Vienna Convention ... 1
) The Reigning Prince shall represent the State in all its relations ...