Which term refers to the part of music that ends a phrase or section?

The term that refers to the part of music that ends a phrase or section is known as a "Double Bar Line." A double bar line is a notation used in musical scores to signal the end of a particular section or the conclusion of a piece. It visually indicates to musicians that the passage is complete and that they should prepare for a transition or a new section of the piece.

In contrast, a fermata indicates a pause or a hold on a particular note or rest, prompting musicians to sustain the note longer than its written value, but it does not signify the end of a section. A glissando is a technique that involves sliding between pitches, typically not associated with marking the end of a phrase. Similarly, tenuto refers to a directive to hold a note for its full length, or slightly longer, which does not denote the termination of a musical idea. Therefore, the double bar line serves a specific structural purpose in music notation, marking closures effectively in a score.