Which term means to return to a section marked by a sign?

The term that denotes a return to a section marked by a sign is "Dal segno." This musical instruction specifically instructs performers to return to a certain point in the piece that is indicated by a symbol resembling an "S" with a line through it.

This is a common practice in music composition, allowing for the repetition of sections without writing out the entire passage again, streamlining the music and highlighting thematic material. The presence of the sign establishes a clear and efficient way to denote where musicians should go back, ensuring clarity in performance and adherence to the composer’s intent.

In contrast, "Da capo" indicates to return to the beginning of a piece, "Coda" refers to a concluding passage that typically follows the main sections, and "Ritornello" describes a recurring theme typically found in concertos. Each of these terms signifies different instructions and structural elements in music, further emphasizing the importance of understanding these distinctions.