Many Semitic languages also have dual numbers. For instance, in Hebrew יים- (-ayim) or a variation of it is added to the end of some nouns, e.g. some parts of the body (eye, ear, nostril, lip, hand, leg) and some time periods (minute, hour, day, week, month, year) to indicate that it is dual (regardless of how the plural is formed). A similar situation exists in classical Arabic, where is added to the end of any noun to indicate that it is dual (regardless of how the plural is formed).