What is the meaning of header?

noun

• A line of text serving to indicate what the passage below it is about.
  • usage: "the heading seemed to have little to do with the text"
  • synonyms: heading, head
• Horizontal beam used as a finishing piece over a door or window.
  • synonyms: lintel
• Brick that is laid sideways at the top of a wall.
  • synonyms: coping, cope
• 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.
• A machine that cuts the heads off grain and moves them into a wagon.
• Soccer) the act of hitting the ball with your head. (
• A headlong jump (or fall. )
  • usage: "he took a header into the shrubbery"