Heading (subject)
A heading is a word, phrase, or sentence that appeared at the beginning of a written passage to indicate its subject.
In 2366, Geordi La Forge asked USS Enterprise-D's computer to bring up information on Leah Brahms, which led to voice entries that had Brahms' voice being used by saying, "Theoretical Propulsion logs, Federation Starship Enterprise, Galaxy class. Heading, Subspace. Author, Leah Brahms." (TNG: "Booby Trap")