Final answer:
The signature sound 'The Clang' became associated with the TV show 'Law & Order'.
Step-by-step explanation:
The signature sound referred to in the question is 'The Clang', created by composer Mike Post. This sound effect became associated with the TV show 'Law & Order'. It is played after the show's famous 'Dun Dun' sound effect, and is commonly used to transition between scenes or signify the beginning or end of a dramatic moment. The combination of the door slamming, gavel, and stomping sounds in 'The Clang' helps to create a sense of tension and urgency, making it a fitting choice for a crime and legal drama like 'Law & Order'.