Typography Glossary: 100 Terms Every Designer Should Know
A–Z definitions of 100 typographic terms: aperture to x-height, baseline to zero-width space. One-sentence definitions, precisely stated.
Typography Glossary: 100 Terms Every Designer Should Know
A
Aperture — The opening of a partially enclosed letterform such as c, e, s, or a; wider apertures improve legibility at small sizes.
Ascender — The portion of a lowercase letter that extends above the x-height, as in b, d, f, h, k, l, and t.
Axis (stress axis) — The angle of the thinnest point in a curved letter; diagonal axis indicates calligraphic influence, vertical axis indicates modern design.
B
Baseline — The invisible line on which the bases of capital letters and most lowercase letters rest.
Baseline grid — A horizontal grid of evenly spaced lines aligned to the baseline, used to maintain consistent vertical rhythm across a layout.
Bowl — The curved, closed or partially closed stroke that forms the round part of letters such as b, d, o, p, and q.
Bracketed serif — A serif joined to the stem with a curved transition (a bracket), as in old-style and transitional typefaces; contrasted with unbracketed (hairline) serifs in modern/Didone faces.
C
Cap height — The height of uppercase letters above the baseline; typically slightly shorter than the ascender height.
Cicero — A unit of measurement in European typography equivalent to approximately 12 Didot points (about 4.51mm); used primarily in French and German printing.
Condensed — A typeface variant with characters significantly narrower than the standard width; used to fit more text in a constrained horizontal space.
Counter — The enclosed or partially enclosed negative space within a letter, as in the interior of o, b, p, or the open space in c and e.
Crossbar — The horizontal stroke in letters such as A, H, e, f, and t.
D
Descender — The portion of a lowercase letter that extends below the baseline, as in g, j, p, q, and y.
Didone — A category of serif typeface with extreme stroke contrast and hairline, unbracketed serifs; includes Bodoni and Didot; also called "Modern."
Display typeface — A typeface designed for use at large sizes (36pt and above) and not recommended for body text.
Dingbat — A decorative character or symbol included in a typeface or as a standalone symbol font; includes bullets, arrows, ornaments, and icons.
E
Ear — The small decorative stroke projecting from the upper right of the bowl of a lowercase g.
Em — A unit equal to the current font size; in a 16px font, 1em = 16px; used in CSS for spacing proportional to type size.
Em dash — A punctuation dash the width of an em (—); used for parenthetical clauses and interrupted dialogue; distinct from en dash and hyphen.
En — A unit equal to half an em; in a 16px font, 1en = 8px.
En dash — A dash the width of an en (–); used for ranges (pages 10–12, 2020–2025) and compound modifiers; narrower than em dash, wider than hyphen.
Extended — A typeface variant with characters significantly wider than the standard width; used for headlines requiring dramatic horizontal presence.
F
Finial — The tapered or curved terminal ending of a stroke in some serif and script typefaces; less angular than a serif.
Fleuron — A typographic ornament in the form of a stylized leaf or flower; used as a section divider or decorative element.
Font — A specific instance of a typeface at a particular size, weight, and style (e.g., Garamond Italic 12pt); commonly used interchangeably with "typeface" in casual usage.
Font stack — A list of typefaces specified in CSS font-family, in priority order; the browser uses the first available face.
Foundry — A company that designs and distributes typefaces; can be digital (Commercial Type, Klim) or historical (the physical manufacturers of metal type).
G
Glyph — A single symbol or character in a typeface, including letters, numerals, punctuation, and special characters; a typeface may contain thousands of glyphs.
Grotesque — An early category of sans-serif typeface with slight irregularity and historical industrial character; includes Akzidenz-Grotesk and Franklin Gothic.
H
Hairline — The thinnest stroke in a typeface; most visible in high-contrast Didone typefaces.
Hanging punctuation — The placement of quotation marks and certain other punctuation characters outside the left or right text margin, so that the text body appears optically aligned.
Hinting — Instructions embedded in a digital font that adjust glyph rendering at low resolutions or small sizes to maintain legibility; critical for screen rendering.
Humanist (sans) — A category of sans-serif typeface influenced by calligraphic hand forms; includes Gill Sans, Frutiger, and Myriad; warmest of the sans categories.
I
Ink trap — A deliberate triangular notch at joins in a letterform, designed to fill with ink in printing and produce optically clean junctions; visible when type is displayed at large sizes.
Italic — A style of type that slants to the right and typically uses cursive letterforms distinct from the roman (upright) design; not merely a slanted version of the roman.
J
Justification — The alignment of text so that both the left and right edges are flush with the text container; achieved by varying word spacing; can create rivers in narrow columns.
K
Kerning — The adjustment of horizontal space between a specific pair of characters to achieve optically consistent spacing; distinct from tracking, which adjusts spacing uniformly.
L
Leading — The vertical distance from the baseline of one line of text to the baseline of the next; named after the strips of lead used in metal typesetting to separate lines.
Leg — The lower diagonal stroke in letters such as K, k, and R.
Letter-spacing — In CSS, a uniform addition to the horizontal space after each character; analogous to tracking in print typography.
Ligature — A special glyph formed by joining two or more characters into a single form to resolve spacing or optical collision, as in the common fi and fl ligatures.
Lining figures — Numerals of uniform height that align between the baseline and cap height; appropriate for financial data and tables; contrast with oldstyle figures.
Link — The stroke connecting the upper and lower bowls of a double-story lowercase g.
M
Measure — The line length of a text column, typically expressed in characters per line; the optimal range for body text is 45–75 characters.
Monospaced — A typeface in which every character has identical advance width; associated with code and typewriter aesthetics.
N
Neo-grotesque — A rationalized category of sans-serif typeface, derived from grotesque but with more consistent construction; includes Helvetica, Arial, and Inter.
Numeral styles — The collection of numeral design variants available in a typeface, typically including lining, oldstyle, tabular, and proportional; controlled with CSS font-variant-numeric.
O
Oblique — A typeface style created by mechanically slanting the roman design, without redesigning the letterforms; distinct from a true italic.
OFL (Open Font License) — A free software license for typefaces, allowing use, study, modification, and distribution; used by Google Fonts and many other free fonts.
Oldstyle figures — Numerals with varying heights that mirror the rhythm of lowercase text, with some ascending and some descending below the baseline; appropriate for body text.
OpenType — A scalable font format developed by Microsoft and Adobe, supporting large character sets, advanced typographic features, and cross-platform compatibility.
Optical sizing — Adjusting a typeface's design characteristics (contrast, spacing, weight) to its rendered size; available in variable fonts via the opsz axis.
Orphan — The first line of a paragraph that appears at the bottom of a column, isolated from the remainder of the paragraph on the next column or page.
P
Pica — A unit of typographic measurement equal to 12 points (approximately 4.23mm or 1/6 of an inch); used primarily in print typography.
Point — The smallest standard unit of typographic measurement; in digital typography, 1 point = 1/72 inch; in traditional Didot system, slightly larger.
Proportional figures — Numerals with varying advance widths based on their natural width; contrast with tabular figures, which have equal width.
R
Ragged right — Left-aligned text with an uneven right margin; the standard for most web body text; produces more even word spacing than justified text.
Recto — The right-hand page of an open book or spread, bearing an odd page number; contrast with verso (left-hand page).
Rem — A CSS unit equal to the font size of the root element; typically 16px unless changed; preferred over px for accessible, scalable type sizing.
River — A visual channel of white space running through justified text, formed by the alignment of word spaces across multiple lines.
S
Sans-serif — A typeface category without serif finishing strokes; includes grotesque, neo-grotesque, geometric, and humanist subcategories.
Scale — A system of related type sizes based on a consistent mathematical ratio, producing harmonious typographic hierarchy.
Script — A typeface category simulating handwriting or calligraphy, ranging from formal copperplate to casual brush lettering.
Serif — A small finishing stroke at the terminal of a letterform; also, the typeface category that includes such strokes.
Set width — The total horizontal space occupied by a character including its sidebearings (built-in spacing on left and right).
Shoulder — The curved stroke coming off the stem in letters such as h, m, and n.
Sidebearing — The horizontal space built into a font character on its left and right sides; contributes to overall inter-character spacing.
Slab serif — A typeface category with thick, rectangular serifs and low or no stroke contrast; includes Rockwell, Clarendon, and Courier.
Slant — The degree of angle of an italic or oblique typeface, measured in degrees from the vertical.
Small caps — Uppercase letterforms drawn to approximately x-height; designed at that size, not mechanically reduced; accessed via OpenType smcp feature.
Spine — The main curved diagonal stroke of the letter S and s.
Stem — The primary vertical or diagonal stroke of a letterform.
Stroke — Any single line or curve that constitutes part of a letterform.
Stylistic set — A group of alternate glyphs in an OpenType font, providing variant letterforms that alter the typeface's visual character without changing its core design.
Swash — An extended, decorative variation of a letterform, typically with exaggerated serifs or strokes; common in italic and display typefaces.
T
Tabular figures — Numerals with identical advance widths, allowing vertical alignment of numbers in columns; essential for data tables and financial displays.
Terminal — The end of a stroke; can be straight, angled, tapered, round, or ball-shaped, depending on the typeface design.
Text figures — Another term for oldstyle figures; numerals with varying heights that blend into lowercase text.
Titling — A variant of a typeface designed specifically for large display use, typically with finer serifs, higher contrast, and tighter spacing than the text version.
Tracking — A uniform adjustment to the spacing between all characters across a range of text; tightening is appropriate for large display type; opening is appropriate for all-caps text.
Transitional — A category of serif typeface between old style and modern, with higher contrast and more vertical stress; includes Baskerville and Times New Roman.
Type family — A collection of typefaces sharing a common design but varying in weight, width, and style (italic, condensed, etc.).
Typeface — A specific type design with a name (Garamond, Helvetica, Inter); often used interchangeably with "font" in casual usage, but technically distinct.
U
Unicase — A typeface that blends uppercase and lowercase letterforms at the same height, eliminating the distinction between cases.
Unicode — The universal character encoding standard, covering virtually all writing systems and symbols; modern fonts typically cover a subset of the Unicode character set.
V
Variable font — An OpenType font format that contains multiple design instances in a single file, with continuous interpolation across design axes such as weight, width, and optical size.
Verso — The left-hand page of an open book or spread, bearing an even page number.
W
Weight — The overall thickness of a typeface's strokes; commonly described in named grades (Thin, Light, Regular, Medium, SemiBold, Bold, ExtraBold, Black) or numeric values (100–900).
Widow — A short last line of a paragraph, typically a single word or very short phrase, stranded at the end of a text block.
Width axis — In a variable font, the axis controlling the horizontal width of characters; mapped to the CSS font-stretch property.
Word spacing — The horizontal space between words; adjusted by justification algorithms and by the CSS word-spacing property.
X
X-height — The height of lowercase letters without ascenders or descenders, measured against the lowercase x; a key factor in perceived legibility at small sizes.
Z
Zero-width space — A Unicode character (U+200B) that allows line breaks without adding visible space; useful in languages without space-separated words and in specific line-break control scenarios.
This glossary is a living document. Use the generator above to experiment with the terms that affect rendering — optical sizing, kerning, leading, measure — and see their effects in context.