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The signal used in Australia in the event of a terrorist attack, natural disaster, dam failure, nuclear explosion, large bushfire, …

The sound played to alert you of an incoming train at a railway crossing.

A sound used in emergency broadcasts, alerts, notices and action-notifications™

A short censor beep sound.

A simple and short 4-tone chime going up.

A simple 9-tone bell to mark lunch time or end of period of end of school.

A simple and short 3-tone chime going up.

A simple and short 3-tone chime going down.

A simple and short 4-tone chime that sound like westminster.

A simple and short 4-tone chime going down.

A simple and short 2-tone chime.