Z classification system

The Z- or Zeta-classifications are a system of classification employed by the United Nations Space Command for cataloguing Forerunner technology and materiel. The system serves as a counterpart to the UNSC's type classification system used for cataloguing Covenant technology.

Overview
The cataloguing system used by UNSC analysts for Forerunner technology sees a given item designated with a Z-, followed by a numerical string. Known strings range from low double digits to quadruple digits, with no apparent indication the numbers employed have any particular inherent meaning (unlike, for example, the Type-designation system's correspondence with the year of cataloguing). Z-classifications are given to a wide array of technology ranging from infantry weapons to Sentinels to even spacecraft.

0-100

 * Z-040 Attenuation Field Generator/Localized
 * Z-90 Photonic Coalescence Emitter/Aegis

101-1000

 * Z-110 Directed Energy Pistol/Exotic
 * Z-130 Directed Energy Automatic Weapon
 * Z-180 Close Combat Rifle/Asymmetric Engagement Mitigator
 * Z-250 Directed Energy Engagement Weapon
 * Z-330 Independent Actuation Defense Escort/Heavy
 * Weapon/Anti-Materiel Z-390 High-Explosive Munitions Rifle
 * Z-400 Pursuit Disruption Grid Generator
 * Z-510 Directed Energy Focus Weapon
 * Z-520 Encounter-Mitigation System
 * Z-750 Special Application Sniper Rifle

1001-10,000

 * Z-1500 Automated Systems Drone
 * Z-1500 Exoatmospheric Multirole Fighter
 * Z-2500 Automated Protection Drone
 * Z-4190 Temporal Protective Enfolder/Stationary Shield
 * Z-5080 Short-Range Spectrum Augmenter/Vision
 * Z-8060 High-Impact Particle Weapon
 * Z-8250 Anti-ship Exterior Defense Network
 * Heavy artillery
 * Light artillery
 * Z-9930 Information Vector Console