An elderly Bajoran held with Li Nalas at the Hutet labour camp on Cardassia IV, who stays behind in 2370 so that Kira and O'Brien can carry the resistance hero to safety.
Borum is a Bajoran prisoner who appears in The Homecoming, the opening episode of Deep Space Nine's second season. Years after the Occupation ended he is still held by the Cardassians at a forced labour camp on Cardassia IV, alongside the celebrated fighter Li Nalas.
When Kira and O'Brien arrive in a borrowed ship to free Li, there is not room or time to take everyone. Borum is one of those who remain and cover the escape, accepting that he may be killed for it.
The Cardassian government, embarrassed by the discovery of the camp, afterwards announces that the remaining prisoners are being released and returned to Bajor.