1. Particle

   don't

   prohibitive; used with dictionary form of verb

   本末を転倒するな。

2. do

   Abbreviationimperative; used with -masu stem of verbsee なさい

3. Interjection (kandoushi)

   hey; listen; look; say

   used to get someone's attention or press one's point

4. Particle

   now, ...; well, ...; I tell you!; you know

   when seeking confirmation, for emphasis, etc.; used at sentence end

5. wow; ooh

   used to express admiration, emotionality, etc.; used at sentence end

6. right?; isn't it?; doesn't it?; don't you?; don't you think?

   Kansai dialectused as a request for confirmation or agreement; used at sentence end

Also written なあnaa、なーnaa、なぁnaa、な〜、なあーnaaa