A printer's mark (or device, emblem, insignia) was a symbol used as a trademark by printers starting in the 15th century.

In the field of typography, color refers to the perceived density of type on its background. It is mainly dependent on the type design (e.g. the weight of the font), but also the typesetting parameters (e.g. tracking, line-spacing).

A font with a width greater than what would be considered “normal” or “regular”.

A small line attached to the end of a stroke in a letter.

Slab serif typefaces are characterized by their thick, block-like serifs.

A bodkin is a piercing tool used in hand typesetting for extracting a piece of type from a form.

The cyma is an element employed to equalize the spacing of irregular letters by placing it where the space is open and requires something more than the plain letter to make word appear solid. This character derives its name from the Greek its undulating form resembling a wave. The cyma is usually attached to the letters A, L, M, W, etc.

Any set of characters, e.g. of a specific font. Not to be mixed up with “character encoding”.

A sign used as a punctuation mark and for various other purposes.

An ear-like stroke, which usually only appears in the design of a double-story g.

One part of a bicameral script with less ascenders and descenders. 

An ellipsis is a character consisting of usually 3 dots. It usually indicates an intentional omission of a word, sentence, or whole section from a text. Depending on the script, the dots can be arranged in different directions.

A decorative illustration on a block used in printing along with the text, e.g. at the beginning or end of a book or chapter of a book.

A descending often decorative stroke.

Letterpress printing is a technique of relief printing using a printing press, a process by which many copies are produced by repeated direct impression of an inked, raised surface against sheets or a continuous roll of paper.

The distance between the baseline and the upper part of lowercase letters that don’t have ascenders.

A triangular or wedge-like protrusion at the end of a stroke. Can also be understood as part of the serifs of a typeface. Some also call them spurs to separate them from serifs.

A person who sets type.

A design feature of a typeface or glyph where the end of a stroke takes a roughly circular shape.

A diacritical mark is a glyph added to a letter, or base glyph.

An underline is a horizontal line immediately below a portion of writing.