What did the two note sound effect in Law and Order series symbolize?

The two-note sound effect in the *Law & Order* series, often referred to as the "dun-dun," symbolizes the arrival of the police.

This iconic sound, composed by Mike Post, is typically heard at the end of a scene where a crime has been committed, or when the police arrive to investigate. It is often followed by the famous *Law & Order* opening theme music.

The "dun-dun" sound became synonymous with the show and serves as a powerful and memorable symbol of justice being served.