零日

zero-day (attack, vulnerability etc) (computing)

zero / nought / zero sign / fractional / fragmentary / odd (of numbers) / (placed between two numbers to indicate a smaller quantity followed by a larger one) / fraction / (in mathematics) remainder (after division) / extra / to wither and fall / to wither

abbr. for 日本[Ri4 ben3], Japan

sun / day / date, day of the month

zero-day vulnerability (computing)