A group, often named or numbered, to which items are assigned based on similarity or defined criteria.
A collection of objects, together with a transitively closed collection of composable arrows between them, such that every object has an identity arrow, and such that arrow composition is associative.
The title or topic of a document, article, chapter, or of a section thereof.
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)
Material for the heads of casks, barrels, etc.
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.