It all depends on what the acronym HP is used for. Most common forms are that of Hit Points, which you have in Role Playing Games as a meaning of Health. The other more common form is Hewlett Packard, which is a computer brand such as Dell. Other possible acronyms/abbreviations include:

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HP Horsepower
HP High Performance
HP Home Page
HP Health Post
HP Hospital (UK)
HP Harry Potter
HP Headphone(s)
HP Heparin
HP High-Profile
HP High Pressure
HP High Point (geographical)
HP High Power(ed)
HP Harp
HP Health Plan
HP High Priority
HP Health Promotion
HP Hyde Park
HP Halbpension (German: halfboard)
HP Hand Picked (groundnuts)
HP Higher Power
HP High Priced
HP Hydrogen Peroxide
HP Hand-Painted
HP Hemel Hempstead (postcode, United Kingdom)
HP Himachal Pradesh (state in India)
HP Highway Patrol
HP High Pitch (musical instruments)
HP Head Phones
HP House Party (Sims expansion pack)
HP Helicobacter Pylori (bacteria)
HP High Purity
HP Honda Prelude
HP Hire Purchase
HP Hole Punch(er)
HP Hidden Power (Pokemon)
HP High Pass (Filter)
HP High Production
HP Heat Pipe
HP High Priest
HP America West Airlines (airline code)
HP Human Performance
HP Hip Pain
HP Helmerich & Payne (oil company)
HP Holding Pattern
HP Health Physics
HP Hello! Project
HP Health Points (video games)
HP Home Port (of a vessel)
HP Hand Phone (cellular phone)
HP Half-Pint
HP Hotplugging (ability to plug in new devices and use immediately)
HP Hersheypark (amusement park Hershey, Pennsylvania)
HP Huntington Park (California)
HP Houses of Parliament (UK)
HP History and Physical (medical)
HP Hypersensitivity Pneumonitis
HP Hoi Polloi
HP Holiday Pay
HP Health Practitioner
HP Hodrick-Prescott (Filter)
HP Honey Pie (Beatles song)
HP Hole Plug
HP Heritage Party (Zambia)
HP Health Physicist
HP Handyphone
HP Hunter's Point (San Francisco district)
HP Hydraulic Platform (self-propelled, fire brigade road vehicle for aerial rescue/firefighting used in UK)
HP Hit Probability
HP Hiroshima Prefecture
HP Herald Press
HP Horizontal Polarization
HP Hollowpoint (bullet)
HP Hot Process (soap making)
HP Hot Pipe
HP Hladno Pivo (band)
HP Horse Piss (Horse Piss Beer)
HP Hindustan Petroleum Corporation Ltd
HP Harmonic Power
HP Hope Page
HP Hintapyyntö (Finnish)
HP Hyper Police (anime series)
HP Hale Pohaku (Dormitory at Mauna Kea Observatories)
HP Heart Points (gaming)
HP Half Position (music)
HP Higher Order Path
HP Heptode
HP Head Prefect
HP Hemi-Pelvectomy (amputation)
HP Hajtás Pajtás (Bike Messenger Company; Hungary)
HP Hide Position
HP Household Profile
HP Head Pixie (cartoon character)
HP Hazi Palinka (Hungarian plum brandy)
HP Human Particulate
HP Health Point(s) (gaming)
HP Hora Prima (Latin: First Hour, epigraphy)
HP Hiper Pool
HP Hypothication
HP Hic Positus (Latin: Buried Here, epigraphy)
HP Honesta Puella (Latin: Virtuous Girl, epigraphy)
HP Hereditatis Possessio (Latin: Ownership by Heritage, epigraphy)
HP Hydrographic Procedure
HP Honestus Puer (Latin: Virtuous Boy, epigraphy)
HP Horizontal Plotter
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http://acronyms.thefreedictionary.com/HP