- X-band
- Radio frequency band spanning 8-12 GHz. Used for military satellite communications, Earth observation data downlink, and weather radar.
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- 3D modelTry it: Defense Spectrum MapTry it: Eo Satellite OpsTry it: Defense Fundamentals Guide+1 more
- XAI — Explainable AI
- Machine learning systems that produce auditable reasoning for each decision — essential for defense applications where accountability, test & evaluation, and post-incident analysis require tracing how a model reached a conclusion.
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- DiagramTry it: Ethics Standards Guide
- XDR — Extended Detection and Response
- Security platform that integrates data across endpoints, networks, servers, email, and cloud to provide unified threat detection, investigation, and automated response across the entire attack surface.
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- 2D animationTry it: Defense Spectrum MapTry it: Cyber Warfare Guide
- Xenon
- A noble gas used as propellant in electric propulsion (ion and Hall effect thrusters). Favoured for high atomic mass, easy storage as supercritical fluid, and chemical inertness.
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- 3D modelTry it: Smad Orbit VisualizerTry it: Space Fundamentals GuideTry it: Ssa Guide+1 more
- XO — Executive Officer
- The second-in-command who supervises the staff and coordinates the internal operation of a unit.
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- XOR — Exclusive OR
- A bitwise Boolean operation that outputs 1 when the inputs differ. The simplest symmetric cipher operation — a one-time pad XORs plaintext with a truly random key of equal length, achieving information-theoretic security.
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- DiagramTry it: Encryption GuideTry it: Waveform GeneratorTry it: Software Testing Guide
- XPD — Cross-Polarization Discrimination
- A measure of how well a dual-polarized system isolates the two polarizations to reuse frequency.
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- XSS — Cross-Site Scripting
- Web vulnerability that injects malicious scripts into pages viewed by other users.
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