1, The full form of ARPA is Advanced Research Projects Agency. It’s used on Governmental ,Military in United States

Defense Advanced Research Projects Agency (DARPA), originally known as Advanced Research Projects Agency (ARPA), is an agency of the United States Department of Defense responsible for the development of new technologies for use by the military.

2, The full form of ARPA is Automatic Radar Plotting Aid. It’s used on Technology ,General in Worldwide

The Automatic Radar Plotting Aid (ARPA) is a marine radar technology capable of creating tracks using radar contacts. The system can calculate the tracked object’s course, speed and closest point of approach, thereby knowing if there is a danger of collision with the other ship or landmass.

3, The full form of ARPA is Atlantic Region Philosophers Association. It’s used on Associations & Organizations ,Professional Associations in Canada

Atlantic Region Philosophers Association (ARPA) is an association formed in 1970 to foster research and scholarship within the philosophical community in Atlantic Canada.

4, The full form of ARPA is Archaeological Resources Protection Act. It’s used on Governmental ,Law & Legal in United States

The Archaeological Resources Protection Act of 1979 (ARPA), is a federal law of the United States passed in 1979 and amended in 1988. It governs the excavation of archaeological sites on federal and Indian lands in the United States, and the removal and disposition of archaeological collections from those sites.