Typographic unit

A standardized measure used to specify type size, spacing, or layout. Common units include the point, pica, em, and en.

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Point (typography): A unit for measuring type size and small typographic distances, traditionally defined as 1/72 of an inch in digital publishing. The point is the standard unit for specifying type size.
Desktop publishing point: A digital publishing unit defined as 1/72 of an inch. It gives digital typography a fixed point definition for sizing text and layout.
Pierre Simon Fournier: An eighteenth-century French type founder who proposed a standardized typographic point system. His system was an early attempt to make type sizes consistent.
Typography: The design and arrangement of type to make written language readable and visually coherent. Typographic units are tools for controlling type and its arrangement.
Pixel: The smallest addressable element in a digital image or display. Pixels describe screen geometry, while typographic units describe type dimensions or relative spacing.
Pica (typography): A typographic unit equal to 12 points, commonly used for measuring line lengths and page dimensions. The pica groups points into a practical unit for layout measurements.
CSS length: A value that specifies a distance in CSS using absolute or relative units. CSS applies typographic units alongside units such as pixels and percentages.
François-Ambroise Didot: A French printer and type founder associated with the Didot point system. The Didot system became a major alternative to Fournier's measurements.
Typesetting: The arrangement of text for reproduction in print or digital form. Typesetting uses units to set sizes, spaces, and line dimensions.
Millimeter: A metric unit of length equal to one thousandth of a meter. Millimeters measure physical lengths directly rather than through type-relative conventions.