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A cicero /ˈsɪsəroʊ/ is a unit of measure used in typography in Italy, France and other continental European countries, first used by Pannartz and Sweynheim in 1468 for the edition of Cicero's Epistulae ad Familiares. The font size thus acquired the name cicero.

It is 1⁄6 of the historical French inch, and is divided into 12 points, known in English as French points or Didot points. The unit of the cicero is similar to an English pica, although the French inch was slightly larger than the English inch. There are about 1.066 picas to a cicero; a pica is 4.23333333 mm and a cicero is 4.51165812456 mm.

Cicero (and the points derived from cicero) was used in the early days of typography in continental Europe. In modern times, all computers use pica (and the points derived from pica) as font size measurement – alongside millimeters in countries using the metric system – for line length and paper size measurement.

References

1. Jacques André and Denis Girou (1999). "Father Truchet, the typographic point, the Romain du roi, and tilings" (PDF). TUGboat. 20. Archived from the original (PDF) on 2018-01-30. Retrieved 2018-01-30.
2. Mario Tomiša, Damir Vusić, Marin Milković (September 2013). "The impact of the historical development of typography on modern classification of typefaces". Tehnicki Vjesnik / Technical Gazette. 20: 905. CiteSeerX 10.1.1.944.672.{{cite journal}}: CS1 maint: multiple names: authors list (link)

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