What does HAI stand for?

Century Aviation International Ltd. - Canada - FAA designator (FAAC)

Habilitation Associates Inc., Salem, OR - Manufacturer code for watercraft hull identification number (USCG)

Haiti (ABBR)

Haiwee - California - Seismograph station code, US Geological Survey - Closed (SEIS)

Hampton Indus - AMEX symbol

Hampton Industries, Inc. - AMEX symbol (SPSG)

Handbook of Artillery Instruments (SAUS)

Handwriting Analysts, Incorporated (SAUO)

Handwriting Analysts, International (EA)

Hawaiian Airlines, Inc. (EFIS)

Health Action International (EA)

Health Assessment Index - Office of Environmental Management, Department of Energy (DEEM)

Helicopter Altitude Indicator (SAUO)

Helicopter Association International (EA)

Helicopter Attitude Indicator

Hellenic Aerospace Industries (SAUO)

Hellenic Aerospace Industry - Greek

Hellenic Aerospace Industry Ltd. (SAUO)

Hellenic Arms Industry - NCIC firearms make code (NCIC)

Hellenic Arms Industry - Greek

Hemagglutination Inhibition - Immunochemistry

Hemagglutination Inhibition Assay (SAUS)

Hemagglutinin Inhibition (STED)

Hepatic Arterial Infusion (STED)

Hepatic Artery Infusion - Chemotherapy

Hessler Associates, Inc. - Commercial firm

Hester Associates, Inc. - Commercial firm

Higbee Associates, Inc. - Commercial firm

High-Altitude Interceptor (SAUS)

Historically Advantaged Institute (SAUS)

History Associates, Inc. - Commercial firm

Holland Automation International - Software retailer (NITA)

Holocaust Awareness Institute (SAUS)

Hosking Aerobatics - Air show performer (ASPC)

Hospital-Acquired Infection - Medicine

Hospital Audiences (EA)

Hospital Audiences Inc. (SAUS)

Hot Air Intake - Automotive engineering

Hughes Associates, Inc. - Commercial firm

Human Awareness Institute (SAUS)

Hydroscience Associates, Inc., Emerson (SAUS)

Hypoglycemia Association, Inc. (NRGU)

Northern Haida - Language code (ETLW)

Three Rivers, MI - Location identifier - FAA (FAAL)

Haida - MARC language code - Library of Congress (LCCP)