To my memory the 'NO' refers to the negative as per linguistic negatives.  It doesnt mean the word "No".  I dont do linguistics (the science of linguistics i.e. which is where that 'No' comes from)but know the wiradjui lannguage and culture pretty well.  A lot copy that 'Wiradjui = No' material not realisng it is not about word definition but linguistic structure.  I just do wiradjuri word definition tied to where the word refers to.  Linguistics/archaeology claims there is just one true 'word' a ssuch which is 'sign'.  There are multiple words if Australia's Indigneous language is considered.  because this language has been mostly separated from what it refers to (cultere) the archs/linguists then think they can take possession.  Its like the rock art battles where some archs claim they must be preserved because current day Indigneosu people are painting over them, (a cultural practice as part of ongoing culture).  So linguistics may tell us that wiradjuri = No.  It doesnt.  The word means what it does similar to 'sign's' referent = sign.