Harf is an Arabic word that means letter. There are a number of synonyms in the Arabic language that can be used in place of harf such as alamat (sign), diacritic (tanween), or alphabet (huroof e tasbeeh). Additionally, numbers can also be considered a synonym of harf as they are used to represent letters sometimes. In Urdu, the word for harf is "huroof" and in Turkish, it is "harf". In Persian, harf is known as "huroof-e-maaruf" which is derived from Arabic. In general, there are many synonyms for harf in various languages, all of which reference the basic unit of written language.