Indicates an unspecified small number of people (e.g., "some people," "a few people").
会場には何人か早く着いていた。
A few people had arrived at the venue early.
何人かに意見を聞いてから決めよう。
Let's ask a few people for their opinions before deciding.
何人かの参加者が写真を撮っていた。
Some participants were taking photos.