What is the meaning of ?

Rōmaji transcription of ねぇ

Rōmaji transcription of ねえ

Rōmaji transcription of ねー

used to deny or disagree with what was said in the preceding affirmative statement; no

used to confirm or agree with what was said in the preceding negative statement; no

used to negate a previous assumption; no

used to correct, precise or reinforce what was said in the preceding utterance; no, rather, actually

used to reinforce a negative statement; no

used instead of a negative verb form; no, ...not

used as a noun, to indicate a negative answer to a question, or to a proposal

Hanyu Pinyin reading of N

Source: wiktionary.org