The late Mike Muuss wrote the “ping” program and named it by analogy to the sound sonar makes for echolocation. The idea is that you would “ping” another computer, and you could find out roughly how far away the other computer was based on how long it took for your ping to get a response.
Here is his website in which he explains the history of the program, which he coded up in one night: https://ftp.arl.army.mil/~mike/ping.html
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