Should it be 'an' or 'a' in front of an abbreviation? [duplicate]
Solution 1:
The pronunciation depends on the words you Utter but not on the phrases , if your abbreviations are acceptable and understandable.
If you pronounce NE seperately , then it is an N E or or if it is pronounced like a single word NE , It becomes a NE, if it is well established like WHO.
NN can be pronounced only seperately so an NN is the only option.