A circle-shaped device used to terminate a stroke, for example on the end of the arm on r, or the tail tip of y. Ball terminals are a prominent feature of so-called “modern roman” types which came into existence in the second half of the 18th century with the appearance of Didones and types used by the Fourniers as well as Giambattista Bodoni. Ball terminals are typically drawn in a strict geometric form of a pure circle. Some types however, principally Baskerville’s roman type, feature organically-shaped ball terminals.
Ball Terminals join the stroke at an angle, as opposed to Lachrymal Terminals which taper into the stroke.
Typographica: A Bevy of Ball Terminals