This is the 2nd most frequent Hindi word.
न
The Hindi word "न" means "no" or "not."
In this context, 'न' is used in an informal ellipsis of 'नहीं' to indicate a negation — 'or not' following a rhetorical question.
तुमने होमवर्क किया या न?
Did you do the homework or not?
Here, 'न' is used as a colloquial tag question to emphasize the speaker's rhetorical query, akin to 'no?' in English.
तुमने उसे ऐसा क्यों किया, न?
Why did you do it like that, no?
Here, 'न' is part of 'नहीं' which is used to indicate a negation — 'or not'.