for certain official business between the clerks of the House of Commons and the House of Lords, and on other official occasions such as the dissolution of Parliament. Latin is also used to a limited degree in certain official mottoes, for example Nemo me impune lacessit, legal terminology (habeas corpus), and various ceremonial contexts. Latin abbreviations can also be seen on British coins. The use of Latin has declined greatly in recent years. However, the Catholic Church retains Latin in official and quasi-official contexts. Latin remains the language of the Roman Rite, and the Tridentine Mass is celebrated in Latin. Although the Mass of Paul VI is usually celebrated in English, it can be and often is said in Latin, in part or whole, especially at multilingual gatherings. It is the official language of the Holy See, the primary language of its public journal, the Acta Apostolicae Sedis, and the working language of the Roman Rota. At one time, Latin and Greek were commonly taught in British schools (and were required for entrance to the ancient universities until 1919, for Greek, and the 1960s, for Latin), and A-Levels and Highers are still available in both subjects. Extinct languages Cornish Cornish became extinct as a first language in the late 18th century, ceasing to have any fully competent speakers by 1800. Its cultural legacy has continued within Cornwall. There are small numbers of second-language speakers of revived varieties of Cornish, and these appear in the table of living languages in this article. Many people therefore regard the Cornish language not as "extinct" but as "critically endangered" or by other similar terms. Norn A North Germanic once spoken in the Shetland Islands, Orkney Islands and Caithness. It is likely that the language was dying out in the late 18th century, with the reports putting the last Norn speakers in the 19th century. Walter Sutherland from Skaw in Unst, who died about 1850, has been cited as the last native speaker of the Norn language. The remote islands of Foula and Unst are variously claimed as the last refuges of the language in Shetland, where there were people "who could repeat sentences in Norn, probably passages from folk songs or poems, as late as 1893". Fragments of vocabulary survived the death of the main language and remain to this day, mainly in place-names and terms referring to plants, animals, weather, mood, and fishing