Block from U+07C0 to U+07FF. This block was introduced in Unicode version 5.0 (2006). It contains 59 codepoints.
The Wikipedia provides the following information on block NKo:
NKo is a Unicode block containing characters for the Manding languages of West Africa, including Bamanan, Jula, Maninka, Mandinka, and a common literary language, Kangbe, also called N'Ko.
N'Ko became part of Unicode with version 5.0 in July 2006.