Prong key

What is Prong key?

Prong key definition and meaning on Dictionary terms:
information, ideas, or rumors deliberately spread widely to help or harm a person, group, movement, institution, nation, etc.
the deliberate spreading of such information, rumors, etc.
the particular doctrines or principles propagated by an organization or movement.
Roman Catholic Church. a committee of cardinals, established in 1622 by Pope Gregory XV, having supervision over foreign missions and the training of priests for these missions. a school (College of Propaganda) established by Pope Urban VIII for the education of priests for foreign missions.

Archaic. an organization or movement for the spreading of propaganda.