What full form of ping?

There isn't a single, universally accepted full form for "ping." It's often used as a verb, meaning to send a test packet to a network device to determine if it's reachable and how long it takes to respond.

However, the term "ping" is derived from the Packet Internet Groper, a utility used to test network connectivity.

Therefore, while "PING" isn't an official acronym, "Packet Internet Groper" is the most common and widely understood explanation of its origin.