Observation Helicopter) HOSTAC – (a) Helicopter Operations from Ships Other Than Aircraft Carriers HOT – (a) Highly Optimised Tolerance HOTAS – (a) Hands on throttle-and-stick HOTT or HotT – (i) Hordes of the Things (miniature fantasy wargaming rules; a play on The Lord of the Rings) HOV – (i) High Occupancy Vehicle HP hp – (s) horse power HP – (i) Hewlett-Packard Hindustan Petroleum (s) Himachal Pradesh (Indian state code) HPA – (i) UK Health Protection Agency HPCL – (i) Hindustan Petroleum Corporation Limited HPGL or HP-GL – (i) Hewlett-Packard Graphics Language HP-IB – (i) Hewlett-Packard Instrument/Interface Bus (first implementation of GP-IB, later standardised and now known as IEEE-488) HP-IL – (i) Hewlett-Packard Interface Loop (serial bus used with some HP calculators and computers, notably the HP-41 and HP-71 series) HPLC – (i) High Performance Liquid Chromatography HPMOR – (i) Harry Potter and the Methods of Rationality (work of Harry Potter fan fiction) HPT – (i) High[er] Payoff Target HPV – (i) Human Papilloma Virus HQ HQ – (i) Headquarters (s) Howland Island (FIPS 10-4 territory code) HQ – (i) High Quality HQDA – (i) Headquarters, Department of the Army HR hr – (s) Croatian language (ISO 639-1 code) HR (s) Croatia (FIPS 10-4 country code; ISO 3166 digram – from the country's native name of Hrvatska) (s) Haryana (Indian state code) (i) Harvard Revised star catalogue Human Resources HRBL – (i) High-level Representation of Behavior Language (original name of the Herbal language) HRD – (i) Human Resource Development HRED – (i) (U.S. Army Research Laboratory's) Human Research and Engineering Directorate (Aberdeen Proving Ground, Maryland) HRF – (i) High Readiness Forces HRH – (i) His (or Her) Royal Highness HRK – (s) Croatian kuna (ISO 4217 currency code) HRM – (i) His (or Her) Royal Majesty HRM – (i) Human Resource Management HRT – (i) Hormone Replacement Therapy hrv – (s) Croatian language (ISO 639-2 code) HRV (s) Croatia (ISO 3166 trigram) (i) High Resolution Visible HS Hs – (s) Hassium HSA – A health savings account available to taxpayers in the United States. HSBC – (i) The Hong Kong and Shanghai Banking Corporation HSC – (i) Higher School Certificate HSM – (i) High School Musical HSMAD – (i) Human Science/Modeling and Analysis Data HSN – (i) Home Shopping Network HSPH – (i) Harvard School of Public Health HSS (i) Health Service Support (i) High-Speed Steel HSSI – (i) High-Speed