Serif - A short line or finishing stroke that crosses or projects from stems or strokes in a character. Serifs have many shapes, including hairline, bracketed, wedge, and slab. Fonts without serifs are called “sans serifs.

Stroke - Any single linear element in a character

Grotesk - The common German name for sans serif faces, as opposed to “Antiqua” which means serif face (a small line or stroke regularly attached to the end of a larger stroke in a letter or symbol within a particular font or family of fonts.