What does HEADER mean?

noun

1. a line of text serving to indicate what the passage below it is about“the heading seemed to have little to do with the text”
2. horizontal beam used as a finishing piece over a door or window
3. brick that is laid sideways at the top of a wall
4. a framing member crossing and supporting the ends of joists, studs, or rafters so as to transfer their weight to parallel joists, studs, or rafters
5. a machine that cuts the heads off grain and moves them into a wagon
6. (soccer) the act of hitting the ball with your head
7. a headlong jump (or fall)“he took a header into the shrubbery”