Cantons of Switzerland the canton of Schwyz. Six of the 26 cantons are traditionally, but no longer officially, called "half-cantons" (, , , ). In two instances (Basel and Appenzell) this was a consequence of a historic division, whilst in the case of Unterwalden a historic mutual association, resulting in three pairs of half-cantons. The other 20 cantons were — and in some instances still are — though only in a context where it is needed to distinguish them from any half-cantons, typically termed "full" cantons in English. The historic half-cantons, and their pairings, are still recognizable in the first article of the
Cantons of Switzerland one federal public holiday (1 August); public holidays otherwise vary from canton to canton. The cantons are listed in their order of precedence given in the federal constitution. This reflects the historical order of precedence of the Eight Cantons in the 15th century, followed by the remaining cantons in the order of their historical accession to the confederacy. The two-letter abbreviations for Swiss cantons are widely used, e.g. on car license plates. They are also used in the with the prefix "CH-" ("Confœderatio Helvetica"—Helvetian Confederation—"Helvetia" having been the ancient Roman name of the region). "CH-SZ", for example, is used for