The principal official languages (German, French, and Italian) have terms, not used outside of Switzerland, known as Helvetisms. German Helvetisms are, roughly speaking, a large group of words typical of Swiss Standard German, which do not appear either in Standard German, nor in other German dialects. These include terms from Switzerland's surrounding language cultures (German ''Billett'' from French), from similar terms in another language (Italian ''azione'' used not only as ''act'' but also as ''discount'' from German ''Aktion''). The French spoken in Switzerland has similar terms, which are equally known as Helvetisms. The most frequent characteristics of Helvetisms are in vocabulary, phrases, and pronunciation, but certain Helvetisms denote themselves as special in syntax and orthography likewise. Duden, the comprehensive German dictionary, contains about 3000 Helvetisms. Current French dictionaries, such as the Petit Larousse, include several hundred Helvetisms.