TN meaning in Regional ?

Tswana, also known by its native name Setswana, is a Bantu language spoken in Southern Africa by about 8.2 million people. It belongs to the Bantu language family within the Sotho-Tswana branch of Zone S (S.30), and is closely related to the Northern Sotho and Southern Sotho languages, as well as the Kgalagadi language and the Lozi language.

Setswana is an official language and lingua franca of Botswana and South Africa. Tswana tribes are found in more than two provinces of South Africa, primarily in the North West, where about four million people speak the language. An urbanised variety, which is part slang and not the formal Setswana, is known as Pretoria Sotho, and is the principal unique language of the city of Pretoria. The three South African provinces with the most speakers are Gauteng (circa 11%), Northern Cape, and North West (over 70%). Until 1994, South African Tswana people were notionally citizens of Bophuthatswana, one of the bantustans of the apartheid regime. The Setswana language in the Northwest Province has variations in which it is spoken according to the tribes found in the Tswana culture (Bakgatla, Barolong, Bakwena, Batlhaping, Bahurutshe, Bafokeng, Batlokwa, Bataung, Bakgatla and Bapo, among others); the written language remains the same. A small number of speakers are also found in Zimbabwe (unknown number) and Namibia (about 10,000 people).