A stroke added as a stop to the beginning and end of the main strokes of a character.
Definition: In typography, a serif is the little extra stroke found at the end of main vertical and horizontal strokes of some letterforms. Serifs fall into various groups and can be generally described as hairline (hair), square (slab), or wedge and are either bracketed or unbracketed.
Hairline serifs are much thinner than the main strokes. Square or slab serifs are thicker than hairline serifs all the way up heavier weight than the main strokes. Wedge serifs are triangular in shape. Unbracketed serifs attach directly to the strokes of the letterform, sometimes abrubtly or at right angles. Bracketed serifs provide a curved transition between the serif and the main strokes. Within these divisions serifs can be blunt, rounded, tapered, pointed, or some hyrid shape.
Some special serif-like character parts are spurs and beaks.
In typography, serifs are semi-structural details on the ends of some of the strokes that make up letters and symbols. A typeface that has serifs is called a serif typeface (or seriffed typeface). A typeface without serifs is called sans-serif, from the French sans, meaning “without”. Some typography sources refer to sans-serif typefaces as “grotesque” (in German “grotesk”) or “Gothic”, and serif types as “Roman”.
Any of the short lines stemming from and at an angle to the upper and lower ends of the strokes of a letter.