PINGERS

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."

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."

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."