pinger

Etymology
From.

Noun

 * 1) A device that emits a short, high-pitched sound burst, such as in sonar or other echo location systems.
 * We couldn't take the boat into the shallows near the reef because our sonar pinger was broken.
 * 1) A device that periodically emits a signal that can be monitored to permit movement tracking.
 * The scientist attached a pinger to the carapace of the sea turtle to track its migration.
 * 1) A computer program that sends a ping message over a network.
 * Some people like fancy pingers with extra features, but I always use the default ping application.
 * 1) A user of a ping program; one who pings.
 * Every time we replace the main page, we get flooded with pingers making sure our web site is still there.
 * 1)  An illicit drug, especially ecstasy, taken for recreational purposes.
 * That was a great party. Everyone took a pinger or two.

Etymology
From /.

Verb

 * 1) to paint