Ballot exhaustion
From Ballotpedia
Ballot exhaustion occurs when a ballot is no longer countable in a tally as all of the candidates marked on the ballot are no longer in the contest. This can occur as part of ranked-choice voting when a voter has ranked only candidates that have been eliminated even though other candidates remain in the contest, as voters are not required to rank all candidates in an election. In cases where a voter has ranked only candidates that did not make it to the final round of counting, the voter's ballot is said to have been exhausted. An exhausted ballot is sometimes referred to as an inactive ballot.[1][2]
