There are many full forms for ARP. In Military,it is Air Raid Precautions
Ref.
wikipedia.org/wiki/Air_Raid_Precautions
abbreviations.com/ARP
The 'w' on an ARP warden stands for Warden.
It means it's the numbering from the Atlas of Peculiar Galaxies, by Halton Arp.
ARP is not an abbreviation, but rather an acronym. It stands for several different things but the most common is Address Resolution Protocol which is used in computer networking.
ar stands for air raid protocal
Air Raid Precaution
Dynamic ARP table entries are created whne a client makes an ARP request that cannot be satisfied by data already in the ARP table.
arp -a show arp
Probably... well... Air Raid Precautions...
Air Raid Precautions
static arp
Bill Arp was born in 1826.
Bill Arp died in 1903.