- N2 Matrix — N-Squared Interface Matrix
- A systems engineering tool mapping interfaces between all pairs of subsystems in a square matrix format. Diagonal = subsystems, off-diagonal = interfaces.
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- Diagram
- NAC — North Atlantic Council
- The principal political decision-making body of NATO, comprising representatives of all member states.
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- Nadir
- The direction from a satellite pointing directly toward the center of the Earth. Nadir-pointing is the default attitude for most Earth observation satellites.
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- NAI — Named Area of Interest
- A point or area where activity, if detected, will help confirm or deny an enemy course of action.
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- NAIF — Navigation and Ancillary Information Facility
- The NASA group that develops and maintains the SPICE geometry system for missions.
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- Named Area of Interest — NAI
- A specific point or area where enemy activity will confirm or deny a course of action. Prioritised for ISR collection during planning as part of the intelligence collection plan.
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- DiagramTry it: Cbrn Defense GuideTry it: Defense Missions Guide
- NASA — National Aeronautics and Space Administration
- US civilian space agency for aeronautics, space research, human spaceflight, planetary science, and technology development. Operates JPL, KSC, JSC, GSFC, and other centres.
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- NASA-STD — NASA Technical Standards
- NASA-published technical standards governing spacecraft design, materials, processes, and verification. NASA-STD-8739 (workmanship), NASA-STD-5001 (structural factors of safety), and NASA-STD-6016 (materials) are widely adopted by US prime contractors and allies.
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- DiagramTry it: Space Standards GuideTry it: Software Testing GuideTry it: Space Environment Effects Guide+1 more
- NAT — Network Address Translation
- A technique that remaps private IP addresses to public ones as packets cross a router.
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- Nation-State Actor
- A threat actor backed by a national government, with sustained budgets, sophisticated tools, and strategic objectives. Distinguished from criminal actors by persistence, targeting, and operational security.
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- Diagram
- NATO — North Atlantic Treaty Organization
- 32-nation collective defense alliance founded 1949. Article 5: attack on one member is an attack on all. Integrated command structure under SACEUR.
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- NATO UAS Classes
- NATO classification by maximum gross take-off weight. Class I (Group 1–3): under 150 kg, includes Micro / Mini / Small. Class II: 150–600 kg, tactical. Class III: over 600 kg, MALE/HALE strategic. Drives airspace integration, operator certification, and acquisition pathways.
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- Diagram
- NB-IoT — Narrowband Internet of Things
- A 3GPP low-power wide-area radio standard for low-rate machine connectivity.
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- NBC — Nuclear, Biological, Chemical
- Legacy term for CBRN (now including radiological). NBC equipment and training remain terminology of record in some NATO publications and older national doctrine.
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- DiagramTry it: Defense Fundamentals GuideTry it: Aerospace Defense Industry GuideTry it: Ttps Guide+1 more
- NCA — National Command Authority
- The President and Secretary of Defense, or their duly deputized successors, who hold ultimate lawful authority over the armed forces.
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- NCO — Noncommissioned Officer
- An enlisted leader who has been given authority to direct and supervise subordinate personnel.
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- NCOIC — Noncommissioned Officer in Charge
- The senior enlisted member responsible for a section, function, or operation.
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- NCS — NATO Command Structure
- The permanent integrated military command framework that directs Alliance forces and operations.
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- NCTR — Non-Cooperative Target Recognition
- Identifying a target without an IFF response.
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- NCW — Network-Centric Warfare
- A doctrine linking sensors, decision-makers, and shooters through a shared information network.
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- NDAA — National Defense Authorization Act
- The annual U.S. law that authorizes funding levels and policies for the Department of Defense.
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- NDB — Non-Directional Beacon
- A ground radio transmitter whose signal an aircraft ADF receiver uses to determine relative bearing.
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- NDR — Network Detection and Response
- Security technology monitoring network traffic using behavioral analytics and machine learning to detect threats bypassing traditional signature-based defenses.
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- DiagramTry it: Interplanetary G2g OpsTry it: Cyber Warfare Guide
- NDVI — Normalised Difference Vegetation Index
- A spectral index from NIR and red reflectance bands quantifying vegetation health and density. Widely used in agriculture and environmental monitoring.
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- NECC — Navy Expeditionary Combat Command
- The command organizing expeditionary forces such as Seabees, EOD and coastal riverine forces.
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- NED — North-East-Down
- Local tangent-plane coordinate frame centred on an observer. X→North, Y→East, Z→Down. Standard in INS, IMUs, radar trackers, and fire-control systems.
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- NEO — Noncombatant Evacuation Operations
- Operations to evacuate US citizens, designated aliens, and protected persons from hostile or potentially hostile environments. High-risk OOTW category requiring rapid deployment and force protection. Governed by JP 3-68 and DoDD 3025.14.
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- DiagramTry it: Ootw Guide SimulatorTry it: Human Spaceflight GuideTry it: Ttps Guide+1 more
- NESZ — Noise Equivalent Sigma Zero
- A measure of SAR system sensitivity — the minimum backscatter coefficient the radar can distinguish from its own thermal noise. Lower NESZ means better detection of weak targets.
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- NETD — Noise-Equivalent Temperature Difference
- The target-to-background temperature difference that produces a signal equal to sensor noise, quantifying thermal sensitivity.
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- Network Security
- Controls protecting networked systems from compromise — firewalls, segmentation, IDS/IPS, VPN, NAC, zero-trust architectures. Distinguished from endpoint and application security by focus on the transit layer.
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- DiagramTry it: Cyber Warfare GuideTry it: Aerospace Defense Industry Guide
- NEZ — No-Escape Zone
- The range envelope within which a missile has sufficient energy to reach the target regardless of its manoeuvre. A key parameter in missile engagement planning.
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- NF — Noise Figure
- A measure of the noise added by an RF component or receiver chain, expressed in dB. Lower noise figure improves receiver sensitivity and overall link margin.
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- NFA — No-Fire Area
- A designated area into which fires or their effects are prohibited except under specified conditions.
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- NFS — NATO Force Structure
- The multinational and national forces made available to NATO but not part of the permanent command structure.
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- NFV — Network Functions Virtualization
- Running network functions like firewalls and routers as software on commodity servers.
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- NGAD — Next Generation Air Dominance
- US Air Force 6th-generation fighter programme — a crewed penetrating counter-air platform plus Collaborative Combat Aircraft (CCA) loyal wingmen. Schedule and design under review as of 2024; Navy variant F/A-XX proceeds in parallel.
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- NGFW — Next-Generation Firewall
- Firewall adding deep packet inspection, application awareness, and integrated intrusion prevention.
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- NGSO — Non-Geostationary Satellite Orbit
- Any satellite orbit other than geostationary, including LEO and MEO constellations, regulated distinctly.
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- NIEL — Non-Ionizing Energy Loss
- Radiation damage to semiconductor crystal lattice from displacement of atoms by protons and neutrons. Degrades solar cell output and bipolar transistor gain over mission lifetime.
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- DiagramTry it: Space Environment Effects Guide
- NIFC-CA — Naval Integrated Fire Control-Counter Air
- A networked fire-control capability enabling engagement of over-the-horizon air threats.
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- NIIN — National Item Identification Number
- The 9-digit portion of a National Stock Number that uniquely identifies a specific item.
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- NIIRS — National Imagery Interpretability Rating Scale
- Scale rating the interpretability of imagery.
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- NIIRS_R — Radar NIIRS
- An interpretability rating scale analogous to visible NIIRS but defined for synthetic aperture radar imagery.
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- NILE — NATO Improved Link Eleven
- The underlying system for Link 22, providing improved tactical data exchange over HF and UHF with IP-based networking, relay capability, and enhanced encryption compared to Link 11.
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- NIPP — National Infrastructure Protection Plan
- US national framework establishing risk management processes, information sharing mechanisms, and public-private partnerships for protecting critical infrastructure across 16 sectors.
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- NIPRNet — Non-classified Internet Protocol Router Network
- The US DoD network for sensitive but unclassified information. Connected to public internet through controlled access points with defense-in-depth security.
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- NIR — Near Infrared
- The infrared band roughly 0.7–1.0 microns, adjacent to visible light and detectable by silicon sensors.
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- NISPOM — National Industrial Security Program Operating Manual
- The U.S. manual prescribing how contractors safeguard classified information.
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- NIST — National Institute of Standards and Technology
- US federal agency developing cybersecurity frameworks, standards, and guidelines including the NIST Cybersecurity Framework and SP 800-53 security controls.
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- NITF — National Imagery Transmission Format
- A standardized container format for packaging imagery with associated metadata and annotations.
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- NL — Noise Level
- The ambient plus self-noise intensity at a sonar receiver that competes with the target signal.
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- NM — Nautical Mile
- A unit of distance at sea equal to one minute of latitude, about 1,852 meters.
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- NMCM — Not Mission Capable Maintenance
- Status indicating equipment cannot perform its mission because required maintenance is not complete.
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- NMCS — Not Mission Capable Supply
- Status indicating equipment cannot perform its mission because a required supply part is unavailable.
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- NOAA — National Oceanic and Atmospheric Administration
- US agency providing space weather monitoring and forecasting. Operates the Space Weather Prediction Center (SWPC) issuing alerts for solar flares, geomagnetic storms, and radiation belt enhancements.
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- Noise Figure
- A measure of the degradation in signal-to-noise ratio caused by a component or receiver chain. Lower noise figure means better sensitivity. Critical for radar and SIGINT receivers.
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- NOISE JAM — Noise Jamming
- Radiating broadband RF noise to mask real targets and degrade an enemy radar signal-to-noise ratio.
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- NORAD — North American Aerospace Defense Command
- The command that assigns catalog numbers to tracked space objects and historically published TLE data.
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- NOTAM — Notice to Air Missions
- Time-critical notice of hazards or changes affecting flight operations.
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- NP — Neyman-Pearson
- A detection criterion that maximizes probability of detection for a fixed probability of false alarm.
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- NPR — NASA Procedural Requirements
- NASA's formal requirements hierarchy — agency-level procedures that mission directorates and centres must implement. The NPR 7120 series governs programme and project management; NPR 7150 covers software engineering.
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- NR — New Radio
- The 3GPP 5G air interface supporting both sub-6 GHz and millimeter-wave operation.
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- NRF — NATO Response Force
- A highly ready and technologically advanced multinational force able to deploy quickly to Alliance operations.
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- NRO — National Reconnaissance Office
- The US agency that designs, builds, and operates the nation's reconnaissance satellites.
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- NSFS — Naval Surface Fire Support
- Gunfire and missile support provided by naval surface ships to forces ashore.
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- NSM — Naval Strike Missile
- A stealthy, sea-skimming anti-ship and land-attack cruise missile used by surface combatants.
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- NSN — National Stock Number
- A 13-digit code that uniquely identifies a standardized item of supply in the federal catalog.
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- NSSK — North-South Station Keeping
- Maneuvers correcting the inclination drift of a geostationary satellite to hold its assigned slot.
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- NSW — Naval Special Warfare
- The maritime special-operations component executed by SEAL teams and special boat units.
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- NTIA — National Telecommunications and Information Administration
- US federal agency managing government use of the electromagnetic spectrum. Publishes the Federal frequency allocation table and coordinates spectrum sharing between military, government, and commercial users.
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- NTO — Nitrogen Tetroxide
- A storable hypergolic oxidizer paired with hydrazine fuels in many spacecraft propulsion systems.
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- NTP — Nuclear Thermal Propulsion
- Propulsion that heats propellant with a nuclear reactor for high thrust and specific impulse.
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- NTSB — National Transportation Safety Board
- The independent US agency that investigates civil transportation accidents, including aviation, and issues safety recommendations.
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- NUC — Non-Uniformity Correction
- Calibration that removes fixed-pattern noise caused by detector-to-detector response differences in a focal plane array.
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- Nuclear Triad
- The three-leg structure of strategic nuclear forces: land-based ICBMs, submarine-launched ballistic missiles (SLBMs), and strategic bombers. Ensures survivable second-strike capability.
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