Berber calendar December - 13 January), and 20 "black nights" (Berber: "iḍan tiberkanin/isṭṭafen", Arabic "al-lyali al-sud"), beginning on the first day of "yennayer", corresponding to the Gregorian 14 January. The first day of the year is celebrated in various ways in the different parts of North Africa. A widespread tradition is a meal with particular foods, which vary from region to region (such as a couscous with seven vegetables). In some regions, it is marked by the sacrifice of an animal (usually a chicken). In Algeria, such a holiday is celebrated even by many people who don't use the Berber calendar in
Berber languages of a lingua franca which became Proto-Berber. Various orthographies have been used to transcribe the Berber languages. In antiquity, the Libyco-Berber script (Tifinagh) was utilised to write Berber. Early uses of the script have been found on rock art and in various sepulchres. Among these are the 1,500 year old monumental tomb of the Tuareg matriarch Tin Hinan, where vestiges of a Tifinagh inscription have been found on one of its walls. Following the spread of Islam, some Berber scholars also utilised the Arabic script. There are now three writing systems in use for Berber languages: Tifinagh, the Arabic script,