A high-pitched, short and somewhat sharp sound.

(submarine navigation) A pulse of high-pitched or ultrasonic sound whose echoes provide information about nearby objects and vessels.

(networking) A packet which a remote host is expected to echo, thus indicating its presence.

(text messaging, Internet) An email or other message sent requesting acknowledgement.

(networking) Latency.

(video games) A means of highlighting a feature on the game map so that allied players can see it.

(Wikimedia jargon) A notification.

To make a high-pitched, short and somewhat sharp sound.

(submarine navigation) To emit a signal and then listen for its echo in order to detect objects.

(networking) To send a packet in order to determine whether a host is present, particularly by use of the ping utility.

(by extension) To send an email or other message to someone in hopes of eliciting a response.

(colloquial) To flick.

(colloquial, sports, intransitive) To bounce.

(colloquial, sports, transitive) To cause something to bounce.

(colloquial, sports) To call out audibly.

(colloquial) To penalize.