- Zenith — Zenith Direction
- Direction pointing away from Earth (opposite of nadir). Used in attitude control as +R direction.
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- Zero Trust
- Security architecture model based on never implicitly trusting any user, device, or network. Requires continuous verification of identity, device health, and authorization before granting access.
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- DiagramTry it: Cyber Warfare GuideTry it: Modern Warfare Guide
- Zero-Day
- A software vulnerability unknown to the vendor with no patch available. Zero-day exploits are highly valued for cyber operations because targets have no specific defense.
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- DiagramTry it: Defense Breakthrough GuideTry it: Cyber Warfare GuideTry it: Mil Ops Degraded Environments+1 more
- ZFW — Zero Fuel Weight
- The total weight of an aircraft and its payload without any usable fuel on board.
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- ZOPA — Zone of Possible Agreement
- The range between each party's reservation prices where a negotiated deal is mutually acceptable. A positive ZOPA exists when buyer's max is above seller's min; negotiation is zero-sum otherwise.
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- Diagram
- ZTA — Zero Trust Architecture
- NIST SP 800-207 security model replacing implicit trust of network location with continuous verification of identity, device posture, and request context. Every access decision is explicit, authenticated, and logged — no flat internal networks.
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- DiagramTry it: Capability Needs Assessment GuideTry it: Cyber Warfare Guide
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