heading vs sandbox

heading

noun
  • Material for the heads of casks, barrels, etc. 

  • The end of a stone or brick which is presented outward. 

  • A strip of material at the hoist end of a flag, used for attaching the flag to its halyard. 

  • 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) 

  • The title or topic of a document, article, chapter, or of a section thereof. 

  • A gallery, drift, or adit in a mine; also, the end of a drift or gallery; the vein above a drift. 

  • The extension of a line ruffling above the line of stitch. 

sandbox

noun
  • A container for sand or pounce, used historically before blotting paper. 

  • An animal's litter box. 

  • The Middle East. 

  • A children's play area consisting of a box filled with sand. 

  • A page on a wiki where users are free to experiment without destroying or damaging any legitimate content. 

  • A box carried on locomotives, from which sand runs onto the rails in front of the driving wheels, to prevent slipping. 

  • An isolated area where a program can be executed with a restricted portion of the resources available. 

  • A box filled with sand that is shaped to form a mould for metal casting. 

verb
  • To restrict (a program, etc.) by placing it in a sandbox. 

How often have the words heading and sandbox occurred in a corpus of books? (source: Google Ngram Viewer )