What does the "R" stand for in the acronym ARPANET?

Question

What does the "P" stand for in the acronym "PDA", that refers to a small computer that has the ability to connect to the internet?

Answer 1

Research
The Advanced Research Projects Agency Network (ARPANET) predated, and prepared for, the Internet. ARPANET was the first wide-area packet-switching network with distributed control and one of the first networks to implement the TCP/IP protocol suite. It was established by the Advanced Research Projects Agency (ARPA) of the United States Department of Defense.