No, “Nǁng” is not a typo. Nor are its variants “N|uu" or “Nlu”. As you’ll see from the video, it’s a way of capturing some of the unique clicking sounds in this endangered language, native to the Kalahari Desert.
In fact, there are just 4-5 speakers left, all aged 80-95, in the form of Hannah Koper and her sisters (the last male speaker passed away in 2013), plus a smattering who can recall isolated words.
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