What is the sound effect ‘Law and Order’ uses called?

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The sound effect that also accompanies on-screen location and date references on franchises of the “Law & Order” series is known internally as the “ching ching.”

• The sound is not played when all location and date text is displayed, but instead typically only play where is there is a significant passage of time between events.
• The sound effect is also played after the show’s opening introduction narrated by announcer Steven Zirnkilton, though often without any location or date.
• According to published reports, the sound effect was custom created for “Law & Order” using a combination of sounds, but is meant to evoke the sound of jail cell door “clanging” shut.