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Acronyms
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
| H&S | Headquarters and Service |
| H-MLP | High Speed Multi Layer Protocol |
| H-Plane | The H-Plane is the plane in which the magnetic field of the antenna lies. The H-Plane is perpendicular to the E-Plane. |
| H/V | Height/Velocity |
| H/W | HardWare |
| HA | High Availability |
| HA | Holding Area |
| HAA | Heavy Antiaircraft Artillery |
| HAARP | High Frequency Active Auroral Research Program |
| HAC | House Appropriations Committee |
| HACV | Heavy Armament Combat Vehicle |
| HAE | High Altitude Endurance |
| HAG | Helicopter Action Group |
| HAGC | Helicopter Action Group Commander |
| HAI | High-level Analog Input |
| HAL | Hard Array Logic |
| HAL | Hardware Abstraction Layer |
| HAL | Hardware Adaptation Layer |
| HAM | Hierarchial Archive Manager |
| HAMPS | Host AUTODIN Message Processing System |
| HAN | Health Alert Network |
| HANAP | Hardness Assessment and Network Analysis Program |
| HANE | High Altitude Nuclear Explosion |
| HAP | Host Access Protocol |
| HAPS | Hurricane Airborne Profiling System |
| HAR | Helicopter Assault Regiment |
| HARDMAN | Manpower Planning for Hardware (Navy/USMC) |
| HARM | High Apeed Anti-Radiation Missile |
| HARM | High Speed Anti-Radiation Missile |
| HAS | Hardened Aircraft Shelter |
| HASC | House Armed Services Committee |
| HASC | House Armed Services Committee (now HNSC) |
| HASP | Hardware Against Software Piracy |
| HAST | Highly Accelerated Stress Test |
| HATIS | Hearing Aid Telephone Interconnect System |
| HATP | High Availability Transaction Processing |
| HATS | Head and Torso Simulator |
| HAZCON | Hazardous Conditions |
| HAZMAT | Hazardous Material |
| HB | Handbook |
| HBA | Host Bus Adapter |
| HBC | House Budget Committee |
| HBCU | Historically Black Colleges and Universities |
| HBCU/MI | Historically Black Colleges and Universities/Minority Institution program |
| HBD | Hierarchical Block Design |
| HBFF | Hit By Friendly Fire |
| HBR | High Bit Rate |
| HBR | House Budget Resolution |
| HBR | Human Behavior Representation |
| HBS | Hardware Breakdown Structure |
| HBT | Hetro-Junction Bipolar Transistor |
| HBTWG | Human Behavior Technology Working Group |
| HBV | Human Behavior Variables |
| HC | Hazardous Code |
| HC | Helicopter Coordinator |
| HC | High-speed CMos |
| HCA | Head of the Contracting Activity |
| HCA | High Consequence Area |
| HCCS | High Confidence Computing Systems |
| HCF | High Cycle Fatigue |
| HCI | Hardness Critical Item |
| HCI | Hardware Configuration Item |
| HCI | Host Controller Interface |
| HCI | Human Computer Interaction |
| HCI | Human Computer Interface |
| HCL | Hardware Compatibility List |
| HCL | Hierarchy Chart Language |
| HCP | Hardness Critical Process |
| HCP | Hazardous Critical Procedures |
| HCS | Helicopter Coordination Section |
| HCT | Hardware Compatibility Tests |
| HCT | High-speed CMos with TTL inputs |
| HCTR | High Capacity Trunk Radio |
| HCU | Hard Copy Utility |
| HCU | Helicopter Control Unit |
| HD | Hard Disk |
| HD | Hard Drive |
| HD | High Density |
| HDA | Hard Disc Assembly |
| HDA | Heads, Actuator, frame and Discs |
| HDBK | Handbook |
| HDC | Harbor Defense Commander |
| HDC | Hard Disc Controller |
| HDC | Hard Disk Controller |
| HDC | Helicopter Defense Command |
| HDC | Helicopter Direction Center |
| HDC | Helicopter Director Center |
| HDCU | Harbor Defense Command Unit |
| HDD | Hard Disc Drive |
| HDD | Hard Disk Drive |
| HDD | High Density Disk |
| HDDS | Hazardous Device Disposal Squad |
| HDF | Hierarchical Data Format |
| HDG | Heading |
| HDI | Head-to-Disk Interface |
| HDI | High Density Interconnect |
| HDIP | Hazardous Duty Incentive Pay |
| HDL | Hardware Description Language |
| HDL | Harry Diamond Laboratories |
| HDLC | High Level Data Link Control |
| HDLC | High-Level Data Link Control |
| HDLC | High-level Data Link Control Protocol |
| HDLU | High speed Dynamic Link Unit |
| HDM | Hardware Device Module |
| HDM | Hierarchical Development Methodology |
| HDML | Handheld Device Markup Language |
| HDOP | Horizontal Dilution Of Precision |
| HDP | Hardware Development Plan |
| HDR | High Data Rate |
| HDRRM | High-Density Radiation-Resistant Microelectronics |
| HDS | Hierarchical Design System |
| HDS | High Definition Systems |
| HDS | Hybrid Decision Support |
| HDSL | High-data-rate Digital Subscriber Line |
| HDTP | Hyper-Data Transfer Protocol |
| HDTV | High Definition Television |
| HDU | Helmet Display Unit |
| HDUX | Half Duplex Transmission |
| HDX | Half Duplex |
| HE | High End |
| HE | High Explosive |
| HE | Human Engineering |
| HE | Hydrophone Effect |
| Heading | The direction of an aircraft path with respect to magnetic or true north. |
| HEADTS | Helicopter and Aircraft Detection Training System |
| HEALT | Helicopter Employment and Assault Landing Table |
| HEAT | Headquarters Effectiveness Assessment Tool |
| HEC | Header Error Count |
| HEC | Helicopter Element Coordinator |
| HEC | High Endurance Cutters |
| HEDM | High Energy Density Matter |
| HEDNA | Hotel Electronic Distribution Network Association |
| HEELS | Helicopter Emergency Egress Lighting System |
| HEFS | Hierarchical Environmental Feature Structure |
| HEI | High Explosive Incendiary |
| HEIAC | Hydraulic Engineering Information Analysis Center |
| HEL | Hardware Emulation Layer |
| HEL | High Energy Laser |
| HELIPAC | Helicopter Piloted Air Combat Model |
| HELO | Helicopter |
| HEML | High Energy Microwave Laboratory |
| HEMP | High Energy Electromagnetic Pulses |
| HEMP | High-altitude Electro-Magnetic Pulse |
| HEMT | High Electron Mobility Transistor |
| HEMTT | Heavy Expanded Mobility Ammunition Trailer |
| HEP | High Explosive Plastic |
| HEPA | High Efficiency Particle Arrester |
| HERF | Hazards of Electromagnetic Radiation to Fuel |
| HERF | Hazards of Electromagnetic Radiation to Fuels |
| HERO | Hazards of Electromagnetic Radiation to Ordinance |
| HERO | Hazards of Electromagnetic Radiation to Ordnance |
| HERO | Heuristic Route Organization |
| HERP | Hazards of Electromagnetic Radiation to Personnel |
| HERS | Helicopter Expedient Refueling System |
| HES | Home Electronic System |
| HES | Hostile Environment Simulator |
| HESH | High Explosive Squash Head |
| HET | HARPOON Embedded Trainer |
| HET | Heavy Equipment Transport |
| HET | Heavy Equipment Transporter |
| HET | Human Exploitation Team |
| HEU | Highly Enriched Uranium |
| HEX | HEXadecimal |
| HF | High Frequency. The portion of the radio spectrum from 3 to 30 MHz. HF communication systems operate in the 2 to 30 MHz portion of the spectrum. |
| HF | Height Finder |
| HF | High Frequency |
| HF | Human Factor |
| HF-ATSS | High Fidelity Acoustic Time Series Simulator |
| HF/DF | High Frequency/Direction Frequency |
| HF/SSB | High Frequency/Single Sideband |
| HFC | Hybrid Fiber Coax |
| HFDL | High-Frequency Data Link |
| HFDL | High Frequency Data Link |
| HFDS | Highly Functional Distributed Systems |
| HFE | Human Factors Engineering |
| HFEA | Human Factors Engineering Analysis |
| HFEA | Human Factors Engineering Assessment |
| HFEN | High Frequency Emergency Network |
| HFIP | High Frequency Improvement Program |
| HFM | Human Figure Models |
| HFR | Hybrid Fibre Radio |
| HFRG | High Frequency Radio Group |
| HFS | High-Frequency System |
| HFSS | High-Frequency Structure Simulator |
| HFSWR | High Frequency Surface-Wave Radar |
| HFTA | Hardware Fault Tree Analysis |
| HFTP | Hybrid-Fiber Twisted Pair |
| HGA | High Gain Antenna |
| HGC | Hercules Graphics Card |
| HGHS | High Gain High Sensitivity |
| HGML | Hyper Graphics Markup Language |
| HGR | Hanger |
| HHC | Hand Held Computer |
| HHD | Hand Held Devices |
| HHDL | Hierarchical Hardware Description Language |
| HHLD | Heading Hold |
| HHQ | Higher Headquarters |
| HHS | Department of Health and Human Services |
| HHT | Hand Held Terminal |
| HHTS | (Department of) Health and Human Services |
| HI | High |
| HI | High Impedance |
| HIA | Hearing Industries Association |
| HIC | Human Interaction Capability |
| HICANS | High-speed Collision Avoidance and Navigation System |
| HICAP | High Capacity |
| HICAP | High Capacity (antenna between aircraft) |
| HICAP | High Combat Air Patrol |
| HID | Human Interface Device |
| HIDACZ | High Density Airspace Control Zone |
| HIDS | Headquarters Information Distribution System (Canadian Army) |
| HIFR | Helicopter In Flight Refuelling |
| HIFR | Hover Inflight Refueling |
| HIG | High Interest Grid |
| HIGE | Hover In Ground Effect |
| HIL | Horizontal Integrity Limit |
| HILEX | High Level Exercise |
| HIMA | Health Industry Manufacturers Association |
| HIMARS | High-Mobility Artillery Rocket System |
| HIMAT | Highly Maneuverable Aircraft Technology |
| HIMATE | High Mach Turbine Engine |
| HIMEZ | High Missile Engagement Zone |
| HIMSS | Health Information Management and Systems Society |
| HINE | Heterogeneous In-house Networking Environment |
| HINS | Helicopter Integrated Navigation System |
| HIPAR | High Power Acquisition Radar |
| HiPER | High Performance Embedded Reasoning |
| HIPERLAN | High Performance Local Area Network (European) |
| HIPIR | High Power Illumination Radar |
| HIPO | Hierarchical input Process output |
| HIPPI | High Performance Parallel Interface |
| HIPPPI | High Performance Parallel Processor Interface |
| HIPRA | High Speed Digital Processor Architecture |
| HIR | Hydrostatic Impact Rocket |
| HIRF | High Intensity Radiated Field |
| HIRF | High Intensity Radiated Fields |
| HIRP | Harpoon Imaging infrared Program |
| HIS | Hardware Intensive Systems |
| HIS | Hospital Information System |
| HIS | Hostile Intelligence Service |
| HIS | Human Systems Integration |
| HISA | Health Information Systems Architecture |
| HISA | Hierarchical Intelligent Simulation Environment |
| HISAM | High Altitude Surface-to-Air Missile |
| HITIS | Hospitality Industry Technology Integration Standards |
| HITL | Human In The Loop |
| HITS | Hawaiian Information Transfer System |
| HIV | Human Immunodeficiency Virus |
| HK | Hook |
| HKM | Hawthorne Key Management |
| HLA | High Level Architecture |
| HLC | Higher Layer Compatibility |
| HLCS | High Lift Control System |
| HLD | Hold |
| HLE | Higher Layer Entity |
| HLF | Home Location Function |
| HLG | High Level Group |
| HLHS | Hidden Line Hidden Surface |
| HLI | High Layer Information |
| HLL | High Level Language |
| HLLAPI | High Level Language Application Programming Interface |
| HLPS | Hot Liquid Process Simulator |
| HLR | Home Location Register |
| HLSC | Helicopter Logistics Support Center |
| HLSG | High Level Steering Group |
| HLST | High Level Study Team |
| HLTF | High Level Task Force |
| HLTFCAC | High Level Task Force on Conventional Arms Control |
| HLTFST | High Level Task Force Support Team |
| HLTG | High Level Task Group |
| HLWG | High Level Working Group |
| HLZ | Helicopter Landing Zone |
| HM | Hardness Maintenance |
| HM | Hazardous Material |
| HM | Hydrogen Monitor |
| HM and E | Hull, Mechanical and Electrical |
| HM&E | Hull Mechanical and Electrical |
| HM/HS | Hardness Maintenance/Hardness Surveillance |
| HM/HW | Hazardous Material/Hazardous Waste |
| HMA | High Memory Area |
| HMAC | Keyed-Hashing for Message Authentication |
| HMC&M | Hazardous Material Control and Management |
| HMD | Head Mounted Display |
| HMD | Helmet Mounted Display |
| HMG | Heavy Machine Gun |
| HMG | Homing |
| HMGP | Hazard Mitigation Grant Program |
| HMH | Heavy Marine Helicopter |
| HMI | Human Machine Interface |
| HMI | Horizontal Motion Index |
| HML | Hazardous Material List |
| HML | Hot Mockup laboratory |
| HMLA | Helicopter Marine Light Attack |
| HMM | Helicopter Marine Medium |
| HMMP | Hazardous Material Management Plan |
| HMMP | Hyper Media Management Protocol |
| HMMRSS | Helmet Mounted Mission Rehearsal Simulation System |
| HMMS | Hypermedia Management Schema |
| HMMWV | High Mobility Mulitpurposed Wheeled Vehicle |
| HMMWV | High Mobility Multi-Wheeled Vehicle |
| HMMWV | High Mobility Multipurpose Wheeled Vehicle |
| HMMWV | High-Mobility Multi-purpose Wheeled Vehicle |
| HMNV | Helmet-Mounted Night Vision |
| HMOS | High Density Metal Oxide Semiconductor |
| HMOS | Hi speed Metal-Oxide Semiconductor |
| HMOS | High Performance Metal Oxide Semiconductor |
| HMOS | High-density Metal Oxide Semiconductor |
| HMPC | Hazardous Maintenance Procedures Code |
| HMPTT | Health Management Protocol Test Tool |
| HMR | Hazardous Material Regulation |
| HMS | Helmet Mounted Sight |
| HMS | Human Safety Mandatory Modification |
| HMS/DS | Helmet Mounted Sight/Display System |
| HMT/D | Helmet-Mounted Tracker and Display |
| HMU | Helmet Mounted Unit |
| HMU | Hydromechanical Unit |
| HMV | High Mobility Vehicle |
| HN | Home Network |
| HN | Host Nation |
| HNCS | Host Naval Computer System |
| HNDLG | Handling |
| HNG | Hanging |
| HNG | Hinge |
| HNI | Home Network Identity |
| HNIP | Host Nation In Place |
| HNOS | Home NetWork Operating System |
| HNS | Host Nation Support |
| HNS | Hughes Network Systems |
| HNSA | Host Nation Support Agreement |
| HNSC | House National Security Committee (formerly HASC) |
| HOB | Height Of Burst |
| HOBA | High Off-Boresight Angle |
| HOD | Head Of Delegation |
| HOGE | Hover Out of Ground Effect |
| HOL | High Order Language |
| HOL | Higher Order Language |
| HOM | Head Of Mission |
| HOM | Higher Order Model |
| HOOPS | Hierarchical Object Oriented Picture System |
| HOOPS | Hierarchical Object-Oriented Programming System |
| HOR | Home of Record |
| HOR | Horizontal |
| HORIZ | Horizontal |
| HOST | Headquarters On-line Systems for Transportation |
| HOST | Hybrid Open Systems Technology (Dept of Veterans Affairs) |
| HOT | Health-Oriented Telecommunications |
| HOTAS | Hands On Throttle And Stick |
| HOTMAC | High Order Turbulence Model for Atmospheric Circulations |
| HOTTS | Harpoon Operator Team Training System |
| HOV | High Occupancy Vehicle |
| HOV | Hover |
| HOW | Hand-Over Word |
| HP | High Pressure |
| HP | Hewlett packard |
| HP | High Power |
| HP | High Profile |
| HP | Horse Power |
| HP-MSOGS | High Performance-Molecular Sieve Oxygen Generation System |
| HP-UX | Hewlitt Pakard's UNIX |
| HPA | High Power Amplifier |
| hPa | hecto Pascal |
| HPA | Hard Physical Address |
| HPAC | Hazard Prediction Assessment Capability |
| HPC | High Pressure Compressor |
| HPC | Handheld Personal Computer |
| HPC | High Performance Computer |
| HPC | High Performance Computing |
| HPC | High Probability of Completion |
| HPCC | High Performance Computers and Communication |
| HPCC | High Performance Computing and Communications |
| HPCCIT | High Performance Computing, Communications, and Information Technology |
| HPCCIT | High Performance Computing, Communications, and Information Technology Subcommittee |
| HPCI | Harmonized Programmable Communications Interface |
| HPCMP | High Performance Computing Modernization Program |
| HPCS | High Performance Computing Systems |
| HPDU | Hydraulic Power Drive Unit |
| HPF | High Pass Filter |
| HPFS | High Performance File System |
| HPGL | Hewlett-Packard Graphics Language |
| HPIB | Hewlwtt Packard Interface Bus |
| HPKB | High Performance Knowledge Base |
| HPL | High-level Programming Language |
| HPL | Home-Phone LAN |
| HPLC | High-Performance Liquid-Chromatography |
| HPLI | Higher Layer Protocol Identifiers |
| HPLV | High Priority Low Volume |
| HPM | High Power Microwave |
| HPMC | High Priority Machine Check |
| HPMS | Hierarchical Process Modeling System |
| HPMWAM | High Power Microwave Weapon Assessment Model |
| HPNA | Home Phoneline Network Alliance |
| HPPI | High Performance Parallel Interface |
| HPPP | High Performance Parallel Processor |
| HPPS | High Pressure Pump Station |
| HPR | High Power Relay |
| HPR | High Performance Routing |
| HPS | High Performance System |
| HPSC | High Performance Super Computer |
| HPSLT | High Power Semiconductor Laser Technology |
| HPSOV | High Pressure Shutoff Valve |
| HPSS | High Performance Storage System |
| HPT | High Pressure Turbine |
| HPT | Hazard Prediction Tool |
| HPT | High Payoff Target |
| HQ | Have Quick |
| HQ | Headquarters |
| HQ AIRNORTH | Headquarters Allied Air Forces North |
| HQ AIRSOUTH | Headquarters Allied Air Forces South |
| HQ NAEW&C FC | Headquarters NATO Airborne Early Warning and Control, Force Command |
| HQ NAVNORTH | Headquarters Allied Naval Forces North |
| HQ NAVSOUTH | Headquarters Allied Naval Forces South |
| HQ NORTH | Headquarters Allied Forces Northern Europe |
| HQ SACLANT | Headquarters Supreme Allied Commander Atlantic |
| HQ SSG | Head Quarters Standard Systems Group |
| HQ SSG (AQ) | Head Quarters Standard Systems Group (Acquisitions Directorate) |
| HQ STRIKFLTLANT | Headquarters Striking Fleet Atlantic |
| HQ SUBACLANT | Headquarters Submarines Atlantic |
| HQAETC | Headquarters Air Education and Training Command |
| HQAMC | Headquarters Air Mobility Command |
| HQAU | Headquarters Air University |
| HQDA | Headquarters, Department of the Army |
| HQII | Have Quick II |
| HQMC | Headquarters Marine Corps |
| HQUSACE | Headquarters United States Army Corps of Engineers |
| HQUSAF | Headquarters United States Air Force |
| HR | Hazard Report |
| HR | House of Representatives (US Congress) |
| HR | Human Resources |
| HR-XML | Human Resources eXtensible Markup Language |
| HRC | Hybrid Ring Control |
| HRC | Hypothetical Reference Circuits |
| HRCP | High Resolution Cloud Prognosis Model |
| HRD | Human Resources Development |
| HRD | Hypothetical Reference Decoder |
| HRDJ1 | Hardwired Jack |
| HRF | High Readiness Force |
| HRI | Human Readable Interpretation |
| HRIS | Human Resource Information System |
| HRMS | Human Resource Management School (AF) |
| HRMSS | Human Resources Management Support System |
| HRP | Helicopter Reference Point |
| HRP | Human Remains Pouch |
| HRPD | High Rate Packet Data |
| HRSS | High Resolution Simulation System |
| HRTF | Head Related Transfer Function |
| HS | Harmonized Standards |
| HS | Harmonized System |
| HS | High Speed |
| HSAL | High Speed Algebraic Logic |
| HSARPA | Homeland Security Advanced Research Project Agency |
| HSB | Hue Saturation Brightness |
| HSC | Hardware Systems Commands |
| HSC | High-Speed Craft |
| HSC | Human Systems Center |
| HSCDS | High Speed Cable Data Services |
| HSCSD | High Speed Circuit Switched Data |
| HSD | High Speed Data Channel |
| HSD | Horizontal Situation Display |
| HSDC | High Speed Digital Chart |
| HSFB | High Speed Fleet Broadcast |
| HSI | Horizontal Situation Indicator. An indicator that displays bearing, glideslope, distance, radio source, course and heading information. |
| HSI | Hardware/Software Integration |
| HSI | High Speed Serial Interface |
| HSI | Hispanic Serving Institutions |
| HSI | Horizontal Situation Indicator |
| HSI | Hot Section Inspection |
| HSI | Human Systems Integration |
| HSI | Hyper Spectral Imagery |
| HSI/DDSM | Human Systems Integration/Directory of Design Support Methods |
| HSIAC | Human Systems Information Analysis Center (Replaces Crew System Ergonomics Information Analysis Center |
| HSIN-CI | Homeland Security Information Network-Critical Infrastructure |
| HSL | Heading Select |
| HSLN | High Speed Local Network |
| HSM | Hierarchical Storage Management |
| HSM | High Speed Memory |
| HSM | High Speed Modem |
| HSMST | High Speed Maneuverable Surface Target |
| HSO | Human Services Officer |
| HSOK | Hunter/Standoff Killer |
| HSP | High Speed Processor |
| HSP | Host Signal Processing |
| HSP | Hosting Service Provider |
| HSR | High Stability Reference |
| HSR | High Speed Research |
| HSRC | Hypotherical Signaling Reference Connection |
| HSS | Health Service Support |
| HSS | Hunter Sensor Suite |
| HSSI | High Speed Serial Interface |
| HSSV | High Speed Surface Vessel |
| HST | Hawaiian Standard Time |
| HST | Helicopter Support Team |
| HST | Hoist |
| HSTU-C | High Speed Transceiver Unit - Central |
| HSTU-R | High Speed Transceiver Unit - Remote |
| HSYNC | Horizontal SYNC |
| HTC | Home Training Center |
| HTCL | Hover Trim Controller |
| HTF | Headline Task Force |
| HTH | Calcium Hypochloride |
| HTI | Horizontal Technology Integration (Army) |
| HTI | Hostile Target Identification |
| HTL | High-Threshold Logic |
| HTML | HyperText Markup Language |
| HTOL | High Temperature Operating Life |
| HTRS | Heaters |
| HTS | High Temperature Superconductivity |
| HTT | Highly Transportable Terminal |
| HTTP | HyperText Transfer Protocol |
| HTTPD | HyperText Transfer Protocol Daemon |
| HTU | Handheld Terminal Unit |
| HTU | Handheld Thermal Unit |
| HUD | Heads Up Display |
| HUD | Head Up Display |
| HUD | Housing and Urban Development |
| HUD | Head-Up Display Systems |
| HUMINT | Human Intelligence |
| HUNTEX | Minehunting Exercise |
| HUS | Hardened Unique Storage |
| HUSK | Hardened Unique Storage Key |
| HUSLE | Helicopter Underslung Load Equipment |
| HVAC | Heating, Ventilation and Air Conditioning |
| HVAC | Heating, Ventilation, and Air Conditioning |
| HVD | High Voltage Differential |
| HVPS | High Voltage Power Supply |
| HVR | Hover |
| HVT | High Value Target |
| HVU | High Value Unit |
| HW | Hardware |
| HW | Hazardous Wast |
| HW | Hazardous Waste |
| HW/SWIL | Hardware/Software In The Loop |
| HWCI | Hardware Configuration Item |
| HWIL | Hardware In the Loop |
| HWIL | Hardware-In-the-Loop |
| HWP | Heavy Weather Plan |
| HWY | Highway |
| HX | Heat Exchanger |
| HYD | Hydraulic |
| HYDIM | Hydraulic Interface Module |
| HYDR | Hydraulic |
| HYDRA | Hierarchical Yet Dynamic Radio Architecture |
| Hypos | Hypotheses |
| HYPROOF | Hyper-Programming System by Object-Oriented Formula |
| HYSAS | Hydrographic Source Assessment System |
| HySTP | Hypersonic Systems Technology Program |
| HyTech | Hypersonic Technology |
| HYTIME | Hypermedia/Time-Based Structuring Language |
| HyTIME | Hypermedia Time Based Structuring Language |
| Hz | Hertz (cycles per second) |
| HZ | Hertz |
