Official language to the government in their native languages. In countries that do not formally designate an official language, a "de facto" national language usually evolves. English is the most common official language, with recognized status in 51 countries. Arabic, French, and Spanish are also widely recognized. An official language that is also an indigenous language is called "endoglossic", one that is not indigenous is "exoglossic". An instance is Nigeria which has three endoglossic official languages. By this the country aims to protect the indigenous languages although at the same time recognising the English language as its lingua franca. Around 500 BC,
Egyptian Sign Language Egyptian Sign Language Egyptian Sign Language is a sign language used by members of the deaf community in Egypt. Although there are no official statistics on the number of deaf people or the number of people who use Egyptian Sign Language as their primary language, Gallaudet University's library resources website quotes a 1999 estimate of 2 million hearing impaired children, while a 2007 study by the WHO places the prevalence of hearing loss in Egypt at 16.02% across all age groups. Egyptian Sign Language is not formally recognized by the government. Linguistically, Egyptian Sign Language is not related to other