What is the term for the short bit of music (Often only a few notes) that occurs at the same point every episode in a TV show?

The original post: /r/television by /u/nachoha on 2025-03-26 02:16:53.

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For example, in Have Gun, Will Travel, whenever Paladin hands someone his card, there’s a close-up of the card, and the same few notes of music plays.