Illustrated Glossary of Organic Chemistry

Signal: A line (or if split a group of lines) in an NMR spectrum.

This simulated 1H-NMR spectrum of 2-methoxybutane has five signals: a singlet (3.4 ppm), a sextet (3.3 ppm), a pentet (1.4 ppm), a doublet (1.2 ppm), and a triplet (0.90 ppm). Click on the image for a larger version.