Does the voting icon appearing in front of every question and answer belongs to the user who posted that, or to the question or particular answer itself?
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If you check the http://stackoverflow.com/faq, it explains..
The voting icon on a question represents voting for the question.
The voting icon on each particular answer represents voting for the answer.
The up/down vote arrows are for scoring the question or answer they are next to.
Reputation gain/loss from clicking the arrows applies to the user who created that question/answer.
Only exception is Community Wiki questions or answers, where no one gains or loses any reputation., but the arrows are still for scoring that specific post.