HP is Hewlett-Packard, a technology corporation.

HP1 may refer to:

• Heterochromatin Protein 1, an important marker molecule in epigenetic research
• Harry Potter and the Philosopher's Stone, the first novel in J.K. Rowling's Harry Potter series
• The postal code for part of Hemel Hempstead in Dacorum, see HP postcode area

Hewlett-Packard Company or HP is an American multinational information technology corporation headquartered in Palo Alto, California, United States that provides products, technologies, software, solutions and services to consumers, small- and medium-sized businesses (SMBs) and large enterprises, including customers in the government, health and education sectors.

Horsepower (hp) is the name of several units of measurement of power. The most common definitions equal between 735.5 and 750 watts. Horsepower was originally defined to compare the output of steam engines with the power of draft horses in continuous operation. The unit was widely adopted to measure the output of piston engines, turbines, electric motors, and other machinery. The definition of the unit varied between geographical regions. Most countries now use the SI unit watt for measurement of power. With the implementation of the EU Directive 80/181/EEC on January 1, 2010, the use of horsepower in the EU is only permitted as supplementary unit.