What does Hn stand for?

Haven - Maps and charts

Henricus de Baila - Flourished, 1169-70 - Authority cited in pre-1607 legal work (DSA)

Haematemesis Neonatorum (DB)

Hafslund Nycomed ADS - NYSE symbol (SPSG)

Handling-Normal (SAUS)

Hardware Capability Name (NITA)

Has Not - Telegraphy (PCTE)

Haygarth's Node - Medicine (MELL)

Head and Neck (DMAA)

Headline News - Cable television channel

Head Nurse

Headquarters Name - Dialog - Searchable field - Information service or system (NITA)

Health Notice (HEAS)

Hear Now - An association (EA)

Heilbronn - Neckar - German license plate city code

Helium Neon - LASER (DGA)

Heller-Nelson - Syndrome - Medicine (DB)

Hemagglutinin-Neuraminidase - An enzyme

Hematemesis Neonatorum - Medicine (DMAA)

Hemorrhage of Newborn - Medicine (DMAA)

Hensen's Node - Medicine (MELL)

Hereditary Nephritis - Medicine (MAE)

Heroes of the Nations - A publication

Herpes Network - Defunct (EA)

Hexagonal Nipple (SAUS)

Hexagonal Nut

Hexagon Nut (SAUS)

High Foliage Nester - Ecology

High Necrosis - Medicine (DMAA)

High Nitrogen - Clinical chemistry

High Nutrition

Hilar Node - Medicine (MAE)

Hindustan-Aeronautics Ltd. - India - ICAO aircraft manufacturer identifier (ICAO)

Histamine-Containing Neuron (DB)

Hoc Nocte - Tonight - Pharmacy

Holds Need - Travel industry (TVEL)

Home Nursing

Honda - Society of Automotive Engineers auto manufacturer code for service information interchange

Honduras - ANSI two-letter standard code (CNC)

Horn

Hospitalman - Nonrated enlisted man - Navy

Host Nation (AABC)

Host to Network - Computer science

House Nigger - Derogatory nickname for an obsequious black person

Human Nutrition - Dietetics (DAVI)

Human Nutrition Research Division - of ARS, Department of Agriculture

- The Hutchinson & Northern Railway Co. - AAR code

Hydronephrosis - Medicine (MELL)

Hypertrophic Neuropathy - Medicine (DMAA)

Naturalis Historia - of Pliny the Elder - Classical studies (OCD)

Nitrogen Mustard - Also, M, MBA, NM - Antineoplastic drug, war-gas base - Army symbol used with numerals, as HN1

NLM-Dutch Airlines - ICAO designator (AD)

Sunset to Sunrise - ICAO (FAAC)

Vanuatu - NCIC country-territory code (NCIC)

Hac Nocte - This Night - Latin (WDAA)

Henna - Philately

Heterogeneous Nuclear - Biochemistry

Horn (WDAA)