(computing) A signed magnitude representation of zero in which the sign bit indicates a negative number.

A structural feature of an automobile/motor car designed to compress during an accident and absorb impact energy.

A range of longitudes where a common standard time is used.

(geography, now rare) Each of the five regions of the earth's surface into which it was divided by climatic differences, namely the torrid zone (between the tropics), two temperate zones (between the tropics and the polar circles), and two frigid zones (within the polar circles).

(transitive) To divide into or assign to sections or areas. / (transitive) To define the property use classification of (an area).

A geographic area in which some sanctioning authority prohibits specific activities, see also Restricted Area.

Alternative form of aleph-null

The scheduled time for the start of some event, especially a military operation; H-hour.

Of any system where all gains are offset by exactly equal losses.

(physics, quantum mechanics) The lowest possible energy of a given quantum mechanical system.