PPVthe activity of asking people how they have voted in an election in order to discover the likely result 投票后民意调查
Examples from the Corpus
exit poll• But then, nemesis: the exit poll, the Basildon result.
From Longman Business Dictionary
exit pollˈexit poll
a poll in which people are asked how they have voted in an election. The poll is taken before the result of the election is known, in order to discover its likely result
Early exit polls suggested he was the clear winner.