Established romanization conventions for various Amami dialects   is posting a false accusation around Wikipedia I made up my own romanization scheme I have no idea why he is so confident He must realize the existence of unknown unknowns in order to stop damaging Wikipedia Maybe I need to recall Hanlons razor but being extraordinarily stupid is almost malicious  Of course it is an established linguistic convention to use  and  for vowels of various Amami dialects that cannot be found in Standard Japanese And they correspond to kana  and  respectively An example available online is  If you need an English source check Moriyo Shimabukuros The Accentual History of the Japanese and Ryukyuan Languages  for example  Ryulong added weird spelling kamwiyaki to the article The Web is now tainted by Ryulongs use of the spelling but at the time of his edit there seem to have only two sites used the weird spelling Both sites are based on Okinawan information Obviously they are unaware of vowels Okinawan dialects does not have