hdg.

Noun

heading (plural headings)

1. The title or topic of a document, article, chapter, or of a section thereof.
   • put the information under the "Advantages" heading
2. (nautical and aeronautical) The direction into which a seagoing or airborne vessel's bow is pointing (apparent heading) and/or the direction into which it is actually moving relative to the ground (true heading)
3. Material for the heads of casks, barrels, etc.
4. A gallery, drift, or adit in a mine, particularly one driving through a solid body of coal or ore; also, the end of a drift or gallery; the vein above a drift.
   • http://undergroundcoal.com.au/fundamentals/01_process.aspx
     Once access has been gained into the coal seam, workings are developed by mining a series of roadways (or headings). These roadways are tunnels largely, if not totally, within the seam, usually rectangular in shape though on occasions they...

   Synonyms:

   roadway

5. The extension of a line ruffling above the line of stitch.
6. The end of a stone or brick which is presented outward.

See all 7 meanings of heading