What does HPL stand for?

Halifax Public Library (SAUO)

Hamilton Public Library - UTLAS symbol

Handbook of Programming Languages (XSAL)

Hartford Public Library, Hartford, CT - OCLC symbol (OCLC)

Haut Pouvoir Lethal (SAUS)

Headquarters Pay List (SAUO)

Heliportugal-Trabalhos e Transporte Aereo, Representacoes, Importacao e Exportacao Lda. - Portugal - ICAO designator (FAAC)

Helix Pomatia Lektin (SAUS)

Herts Pharmaceuticals Limited (SAUO)

Hewlett-Packard Language (SAUO)

Highest Point Level (SAUS)

High Level Programming Language (SAUS)

High Performance Logic (AAEL)

High Polar Latitude - Geophysics

High-Power LASER

High-Pressure Laminate - Plastics

High Pressure Liquid (HAWK)

High-Pressure Liquid - Automotive engineering

Himal Power Ltd. (SAUO)

Home Product Link (SAUS)

Hopeless - Telegraphy (PCTE)

Horizontal Projection Limit - Aircraft operations

Horn Point Environmental Laboratories (SAUS)

Horse Protection League - Association (EA)

Hotel Properties Ltd. - Singapore

Houston Pipe Line (SAUS)

Houston Public Library (SAUO)

Human Pamtid Lysozyme (SAUS)

Human Pancreatic Lipase - An enzyme

Human Parotid Lysozyme - An enzyme

Human Performance Laboratory - Ball State University - Research center (RCD)

Human Peripheral Lymphocyte

Human Placental Lactogen - Also, CGP, HCS - Endocrinology

Hutton Procedural Language (SAUS)

Hybrid Programming Language - Computer science

Hyperplexia (STED)

Hy-Ryder - NCIC boat manufacturer code (NCIC)

Hy-Ryder Inc., Tomahawk, WI - Manufacturer code for watercraft hull identification number (USCG)

Nucla, CO - Location identifier - FAA (FAAL)

Hospital (SAUS)