Turkish Identification Number
Turkish Identification Number (Turkish: Türkiye Cumhuriyeti Kimlik Numarası or abbreviated as T.C. Kimlik No.) is a unique personal identification number that is assigned to every citizen of Turkey. Foreigners residing in Turkey at least six months for any purpose receive a Foreigner Identification Number, which is different from the Turkish Identification Number.
Source: Wikipedia — Turkish Identification Number (CC BY-SA 4.0)