also: れいきょり
noun
point-blank range; very close range; close quarters
Describes a distance so short that the target is extremely close, often used in military, shooting, or figurative contexts for being very near.
狙撃手はゼロ距離から標的を撃った。
The sniper shot the target from point-blank range.
彼らはゼロ距離で話し合った。
They talked at very close quarters.
至近距離 also means 'very close range' but is more general and less emphatic than ゼロ距離, which implies virtually no distance.
Compound of ゼロ (zero) and 距離 (distance). The kanji form 零距離 uses the native Japanese reading れい for zero. The term is a modern coinage, likely influenced by English 'zero distance'.