Capital and minuscule letters are differentiated in the Roman, Greek, Cyrillic, Armenian and Coptic alphabets. Most writing systems (such as those used in Georgian, Glagolitic, Arabic, Hebrew, and Devanagari) make no distinction between capital and lowercase letters, a system called unicase. Indeed, even European languages did not make this distinction before about 1300; both majuscule and minuscule letters existed, but a given text would use either one or the other. In alphabets with a case distinction, capitals are used for capitalization, acronyms, and emphasis (in some languages).Capitalization is the writing of a word with its first letter in uppercase and the remaining letters in lowercase. Capitalization rules vary by language and are often quite complex, but in most modern languages that have capitalization, the first word of every sentence is capitalized, as are all proper nouns. Some languages, such as German, capitalize the first letter of all nouns; this was previously common in English as well. (See the article on capitalization for a detailed list of norms).