Underhang seat
（重定向自Underhang）
In proportional representation (PR) electoral systems, an underhang seat is a seat to which a party is entitled by virtue of the share of the votes it has received but is unable to fill through having submitted too few candidates.
Under party-list proportional representation systems, parties receive a number of seats in proportion to the number of votes they received. If a party does not have enough people to fill its vacancies, there is an underhang. For example, if a party wins enough votes for ten seats, but only have seven people nominated on its list, then there is an underhang of three seats.