In the theory of word formation, abbreviations and truncations are distinguished. Abbreviations or abbreviations are words created as a result of preserving individual elements of a phrase in oral or written form, while simultaneously eliminating other parts of the words included in it. Abbreviations are alphabetic (USA), sound (university), sound-letter (CSKA-pronounced: tse-es-ka), syllabic (Mosstroy) etc. Truncations are formed as a result of saving part of a single word in oral or written form. Initially, written truncations were created, for example, g - gram, km-kilometer. Then pronounced (lexical) formations became widespread. Oral truncations appeared in colloquial speech, they often had a joking character:"Our deputy has a harsh wife"; "I lent him three re's." Later, the truncations were changed to business and journalistic styles (auto, movie). In every modern language, they are based on the phonetic and word-forming features of this language. In French, with its emphasis on the last syllable of the word, only the end parts of the words can be preserved: pitaine from capitalize - captain; in English-initial, end and even middle sounds: lab from laboratory - laboratory, bus from autobus-bus, flu from influenza-influenza, Spanish flu. The name of the new euro currency unit is an international truncation from the words Europe, European. It has the same meaning for all languages that use it, and a different national form, depending on the language. In Russian, euro is a non-declinable masculine noun.