Multiple headlines on a newspaper, 1986
A headline was the title of an article or report.
In 1930, a newspaper article about the death of Edith Keeler began with the headline, "Social Worker Killed". (TOS: "The City on the Edge of Forever")
In an alternate timeline where Edith Keeler lived after 1930, an article in The Star Dispatch ran with the headline "FDR Confers With Slum Area "Angel" on February 23, 1936. (TOS: "The City on the Edge of Forever")
In Benjamin Sisko's illusion of 1953, newspapers of the The New York Globe had the headlines, "Reds Test H-Bomb" and "United Nations Meets in London". (DS9: "Far Beyond the Stars")
In 1986, the main article on the front page of the San Francisco Register ran with this headline, "Nuclear Arms Talks Stalled. Geneva Summit In Doubt." (Star Trek IV: The Voyage Home)
In 2373, in an article written by Jake Sisko for the Federation News Service, he began his journalistic piece with this headline, "Bajorans continue negotiations with Dominion. Station Commander opposes nonaggression pact.". (DIS: "Call to Arms")
In 3189, Fleet Admiral Charles Vance told Commander Michael Burnham that he would be sending a full report to Ni'Var with the headline, "Michael Burnham is Coming". (DIS: "Unification III")