What does ha stand for?

Hectare (DMAA)

Hahnium - Proposed name for chemical element 105

Hakim-Adams - Medicine (EDAA)

Hallah (BJA)

Hardened in Air (SAUS)

Hare's English Vice-Chancellors' Reports - 66-68 English Reprint - 1841-53 - A publication (DLA)

Hartmann Number - IUPAC

Hawaii (SHCU)

Apogee Altitude (NASA)

CASA - Construcciones Aeronauticas Sociedad Anonima - Spain - ICAO aircraft manufacturer identifier (ICAO)

Chem. Werke Albert - Germany - Research code symbol

Habitual Abortion - Medicine

Haemagglutination (SAUS)

Haemagglutinin (SAUS)

Hagen - Westfalen - German license plate city code

Haiti - or Haitian (WDAA)

Half Action (ACAE)

Half Adder - Circuitry (MSA)

Half Adding (SAUS)

Half Adjust (SAUS)

HAL, Inc. - AMEX symbol (COMM)

Hallux Abductus - Orthopedics (DAVI)

Halothane Anesthia - Medicine (MELL)

Hamburg-Antwerp (SAUS)

Hamilton Aerospace (SAUS)

Hampton Associates, Inc. - Commercial firm

Hand Actuated (IAA)

Hand-Actuated (SAUS)

Hand Applanation (SAUS)

Handelsakademie (SAUS)

Hanford Operations Office (SAUS)

H Antigen (DB)

Hard Aggregate (SAUS)

Hard Attacks

Hard Axis (SAUS)

Hardboard Association (SAUO)

Hardness Assurance (MSA)

Hardware - Computer science (IAA)

Hardware Age (SAUS)

Hardy Annual - Horticulture (ROG)

Harmonic Analysis (SAUS)

Harmonic Approximation (SAUS)

Harmonic Average (SAUS)

Harmonie Associates (EA)

Harness Assembly

Hatch (RIMS)

Hatch Act - 1887

Hatchway (DS)

Hawaii - or Hawaiian (WDAA)

Hawaiian Air (SAUS)

Hawaiian Air Lines (SAUO)

Hawaiian Airlines 'A' - AMEX symbol

Hawaiian Airlines, Inc. - ICAO designator (ICDA)

Hawaiian Airlines, Inc. - AMEX symbol (SAG)

Hay - Telegraphy (PCTE)

Hazard Analysis (NASA)

Hazard Assessment - Environmental science (COE)

Hazardous Area

Hazards Assessment (SAUS)

Headache

Head Address (SAUS)

Head Aim (ACAE)

Head Amplifier (SAUS)

Header Authentication (VLIE)

Headmasters - or Headmistresses Association (EA)

Headquarters Administration (SAUO)

Headquarters Administration Division - Coast Guard

Health Academy - An association (EA)

Health Act (OICC)

Health Advisory (GNE)

Health Affairs - Army (DOMA)

Health Alliance - Consumer representation

Health Alliances (SAUS)

Health and Affairs (ACAE)

Health Assessment (BCP)

Health Authority (SAUS)

Healthy America - An association - Defunct (EA)

Hearing Aid

Heated Aerosol (IDYL)

Heavy Armor (SAUS)

Heavy Artillery

Heavy Atoms

Hectare (AAG)

Hectocotylized Arm

Heeres-Atmer - Service Oxygen Breathing Apparatus - German military - World War II

Hefte von Auschwitz (BJA)

Height Age - Medicine (EDAA)

Height of Apogee

Heir Apparent

Helicopter Attack (SAUS)

Hellenic Army (MCD)

Hemadsorbent (MELL)

Hemadsorption - Hematology

Hemagglutinating Activity - Hematology (DAVI)

Hemagglutinating Antibody - Hematology (DAVI)

Hemagglutinating Antigen - Hematology (DAVI)

Hemagglutination - Hematology

Hemagglutinin (SAUS)

Hemolytic Anemia - Hematology

Hemophiliac with Adenopathy - Medicine (EDAA)

Henry Adams, Inc. - Baltimore, MD (TSSD)

Henry Adams, Inc. - Commercial firm

Henson Associates - Television production company

Hepatic Agenesis (MELL)

Hepatic Artery - Anatomy (MAE)

Hepatitis A (SAUS)

Hepatitis Associated - Virus

Heptaldehyde-Aniline (EDCT)

Heptaldehyde-Aniline Condensate (EDCT)

Heptoic Aldehyde (SAUS)

Herpes Association - British (DBA)

Heterophile Antibody - Immunochemistry

Heyden Antibiotic - Pharmacology

High Altitude

High Amplitude (IAA)

High Angle

High Anxiety (MAE)

High Aperture (SAUS)

High Authority of the ECSC - European Coal and Steel Community (ILCA)

High Availability (SAUS)

Higher Authority

Highway Act (SAUS)

Highways Act - British (ILCA)

Hindustan Aircraft Ltd., Bangalore (SAUO)

Hippuric Acid (MELL)

Hiram Abiff - Freemasonry (ROG)

Histamine - Medicine (DB)

Histocompatibility Antigen (DB)

Historia Animalium - of Aristotle - Classical studies (OCD)

Historians Anonymous - Association (EA)

Historical Association - British (EAIO)

History Abstracts - Database (NITA)

Hit Avoidance - Military technology (DDF)

Hoc Anno - This Year - Latin

Hockey Association - British

Hoe Automation (SAUS)

Holic Angle (SAUS)

Holiness Army (ROG)

Homatropina (SAUS)

Home Address

Home Automation (SAUS)

Homesteaders Association - Defunct (EA)

Horn Alert

Horse Artillery

Horticultural Abstracts

Horticultural Abstracts - A publication (SAUS)

Horton's Arteritis - Medicine (EDAA)

Hosanna Army (ROG)

Hospice Association (EA)

Hospital Academy (EA)

Hospital Admission

Hospital Apprentice - Navy rating

Hospital Association (SAUO)

Hospitalman Apprentice (SAUO)

Host Adapter

Host Agent (SAUS)

Hostile Aeroplane - British military (DMA)

Hostile Aircraft (SAUS)

Hot Air

Hounsfield Unit - On computerized tomography - Radiology (DAVI)

Hour Angle - Navigation

Hour Aspect (SAUS)

House Account - Business term

House Administration (DLA)

House of Assembly (SAUO)

Housewives Association - Australia

Housing Allowance - Military

Housing Assistance - HUD

Housing Assistant (SAUO)

Housing Authority

Hoverclub of America (EA)

Hudson and Associates, L.L.C. - Commercial firm

Huius Anni - This Year's - Latin

Human Adaptability

Human Albumin (MELL)

Humanalbumin (SAUS)

Human Argininosuccinate Lyase - An enzyme

Humanitarian Assistance - Environmental science (COE)

Humic Acid - Organic chemistry

Humor Association (EA)

Humorolics Anonymous (EA)

Hungaria (SAUS)

Hungarian Association - Australia

Hungary (SAUS)

Hurry Answer - Telegraphy (PCTE)

Hyaluronic Acid - Biochemistry

Hydraulic Actuator (SAUS)

Hydraulic Association of Great Britain (BI)

Hydraulics Association (SAUS)

Hydrocephalus Association (EA)

Hydrologic Atlas (SAUO)

Hydrophone Allowance - British military (DMA)

Hydrotechnique Association (SAUO)

Hydroxyapatite - Also, HAP - A mineral

Hydroxylapatite - Inorganic chemistry

Hyperalimentation - Intravenous feeding (DAVI)

Hyperandrogenism - Medicine (EDAA)

Hypermetropia, Absolute - Ophthalmology

Hypersensitivity Alveolitis - Medicine (DB)

Hypertensive Angiopathy (SAUS)

Hypoglycemic Association - Australia

Hypothalmic Amenorrhea - Medicine (DAVI)

Netherlands - IYRU nationality code (IYR)

P-Hydroxyanisole (SAUS)