also: ぞんぴ
noun
existence or nonexistence; life or death
Formal noun used to ask or state whether something or someone exists or is alive. Often appears in contexts like checking survival or verifying presence.
遭難者の存否はまだ確認されていない。
The fate of the missing persons has not yet been confirmed.
古文書の存否を調査する。
Investigate whether the ancient documents still exist.
有無 also means existence or presence, but is more common and less formal; 存否 is used in more serious or official contexts, often about life or survival.
Compound of 存 (exist, suppose) and 否 (negation, not). The reading そんぴ is a regular on'yomi combination; ぞんぴ is a variant with rendaku-like voicing, now less common.