T.A.T. Communications was a television production company founded in 1974 by Norman Lear and talent agent Jerry Perenchio, and its closing logo appeared at the end of the sitcoms it produced during the late 1970s. The name came from the Yiddish phrase meaning to knock on wood. The ident heard here is a short voice-and-jingle combination typical of the era, when production companies closed every episode with a formal audio signature. Today the clip circulates online as a piece of television nostalgia, popular with editors who use it to give modern meme videos an ironic vintage broadcast finish.