There is a coin with exact same name and ticker from year 2015
listed on Yobit exchange.

   
(ANN) (X11 Nitrous) POW/POS New UI Built-in Blockexplorer/stats - YoBit
https://bitcointalk.org/index.php?topic=1156351.0

https://yobit.net/en/trade/N2O/BTC