Haas Automation, Inc is an American machine tool builder headquartered in Oxnard, California, that designs and manufactures precision machine tools and specialized accessory tooling, mostly computer numerically controlled (CNC), such as vertical machining centers and horizontal machining centers, lathes/turning centers, and rotary tables and indexers. Most of its production and manufacturing process occurs at the company's main facility in Oxnard. Haas is one of the largest machine tool builders in the world by total unit volume.

Habasit Holding Habasit Holding AG, headquartered in Reinach, Switzerland, is a Swiss manufacturer of timing and conveyor belts, including fabric-based belts, plastic modular belts and power transmission belts. The Group also supplies gears and motors. Habasit has more than 30 subsidiaries, 16 production units, and around 250 service providers and representatives in more than 70 countries. In 2013, the Group employed over 3,600 people globally, and recorded consolidated Group revenues of CHF 629.6 million.

Hach Company manufactures and distributes analytical instruments and reagents used to test the quality of water and other liquid solutions. Manufactured and distributed worldwide, Hach systems are designed to simplify analysis by offering on-line instrumentation, portable laboratory equipment, prepared reagents, easy-to-follow methods, and technical support.Hach is a wholly owned subsidiary of Danaher Corporation (DHR), a Fortune 500 corporation.Hach’s global headquarters in Loveland, Colorado, houses research and development laboratories, instrument manufacturing operations, and the Hach Technical Training Center. Hach has an additional facility in Ames, Iowa, for manufacturing and packaging Hach's chemical reagents and test kits.

A hacksaw is a fine-toothed saw, originally and mainly made for cutting metal. The equivalent saw for cutting wood is usually called bow saw. Most hacksaws are hand saws with a C-shaped frame that holds a blade under tension. Such hacksaws have a handle, usually a pistol grip, with pins for attaching a narrow disposable blade. The frames may also be adjustable to accommodate blades of different sizes. A screw or other mechanism is used to put the thin blade under tension. On hacksaws, as with most frame saws, the blade can be mounted with the teeth facing toward or away from the handle, resulting in cutting action on either the push or pull stroke. In normal use, cutting vertically downwards with work held in a bench vice, hacksaw blades are set to be facing forwards.

The Häfele Group (Häfele GmbH & Co KG) is a German family enterprise with its head office in Nagold, Germany. Häfele is the leading international manufacturer and supplier of furniture fittings and architectural hardware, with subsidiaries in 150 countries. Häfele's furniture fittings (hinges, drawer systems, handles, connectors, ambient lighting), architectural hardware (door hardware and electronic locking systems), and other related fittings are specifically designed for the furniture, building, and hardware supply industries. Häfele manufactures a diverse range of products from ironing boards to door closers. In the 2015 financial year the Häfele group had a turnover of 1.272 billion Euros with 37 subsidiaries in 6 continents. The turnover share abroad was 79%. The company has 7,100 employees worldwide.

Hafnium is a chemical element with symbol Hf and atomic number 72. A lustrous, silvery gray, tetravalent transition metal, hafnium chemically resembles zirconium and is found in many zirconium minerals. Its existence was predicted by Dmitri Mendeleev in 1869, though it was not identified until 1923, by Dr Alexander Scott, making it the last stable element to be discovered. Hafnium is named after Hafnia, the Latin name for Copenhagen, where it was discovered. Hafnium is used in filaments and electrodes. Some semiconductor fabrication processes use its oxide for integrated circuits at 45 nm and smaller feature lengths. Some superalloys used for special applications contain hafnium in combination with niobium, titanium, or tungsten. Hafnium's large neutron capture cross-section makes it a good material for neutron absorption in control rods in nuclear power plants, but at the same time requires that it be removed from the neutron-transparent corrosion-resistant zirconium alloys used in nuclear reactors.

Hagia Sophia (; from the Greek: Αγία Σοφία, pronounced [aˈʝia soˈfia], "Holy Wisdom"; Latin: Sancta Sophia or Sancta Sapientia; Turkish: Ayasofya) was a Greek Orthodox Christian patriarchal basilica (church), later an imperial mosque, and is now a museum (Ayasofya Müzesi) in Istanbul, Turkey. The Roman Empire's first Christian Cathedral, from the date of its construction in 537 AD, and until 1453, it served as an Eastern Orthodox cathedral and seat of the Patriarch of Constantinople, except between 1204 and 1261, when it was converted by the Fourth Crusaders to a Roman Catholic cathedral under the Latin Empire. The building was later converted into an Ottoman mosque from 29 May 1453 until 1931. It was then secularized and opened as a museum on 1 February 1935. Famous in particular for its massive dome, it is considered the epitome of Byzantine architecture and is said to have "changed the history of architecture". It remained the world's largest cathedral for nearly a thousand years, until Seville Cathedral was completed in 1520. The current building was originally constructed as a church between 532 and 537 on the orders of the Byzantine Emperor Justinian I and was the third Church of the Holy Wisdom to occupy the site, the previous two having been destroyed by rioters. It was designed by the Greek geometers Isidore of Miletus and Anthemius of Tralles. The church was dedicated to the Wisdom of God, the Logos, the second person of the Trinity, its patronal feast taking place on 25 December, the commemoration of the birth of the incarnation of the Logos in Christ. Although sometimes referred to as Sancta Sophia (as though it were named after Sophia the Martyr), sophia being the phonetic spelling in Latin of the Greek word for wisdom, its full name in Greek is Ναὸς της Αγίας τοῦ Θεού Σοφίας, Naos tēs Hagias tou Theou Sophias, "Shrine of the Holy Wisdom of God". The church contained a large collection of relics and featured, among other things, a 15-metre (49 ft) silver iconostasis. The focal point of the Eastern Orthodox Church for nearly one thousand years, the building witnessed the excommunication of Patriarch Michael I Cerularius on the part of Humbert of Silva Candida, the papal envoy of Pope Leo IX in 1054, an act that is commonly considered the start of the East–West Schism. In 1453, Constantinople was conquered by the Ottoman Empire under Mehmed the Conqueror, who ordered this main church of Orthodox Christianity converted into a mosque. Although some parts of the city of Constantinople were falling into disrepair, the cathedral was maintained with an amount of money set aside for this purpose. Nevertheless, the Christian cathedral made a strong impression on the new Ottoman rulers and they decided to convert it into a mosque. The bells, altar, iconostasis, and other relics were destroyed and the mosaics depicting Jesus, his Mother Mary, Christian saints and angels were also destroyed or plastered over. Islamic features—such as the mihrab, minbar, and four minarets—were added. It remained a mosque until 1931, when it was closed to the public for four years. It was re-opened in 1935 as a museum by the Republic of Turkey. Hagia Sophia was, as of 2014, the second-most visited museum in Turkey, attracting almost 3.3 million visitors annually. According to data released by the Turkish Culture and Tourism Ministry, Hagia Sophia was Turkey's most visited tourist attraction in 2015. From its initial conversion until the construction of the nearby Sultan Ahmed Mosque (Blue Mosque of Istanbul) in 1616, it was the principal mosque of Istanbul. The Byzantine architecture of the Hagia Sophia served as inspiration for many other Ottoman mosques, such as the aforementioned mosque, the Şehzade Mosque, the Süleymaniye Mosque, the Rüstem Pasha Mosque and the Kılıç Ali Pasha Complex.

The Hahnenkamm is a mountain in Europe, directly southwest of Kitzbühel in the Kitzbühel Alps of Austria. The elevation of its summit is 1,712 metres (5,617 ft) above sea level. The Hahnenkamm (German: rooster's comb) is part of the ski resort of Kitzbühel, and hosts the annual World Cup alpine ski races, the Hahnenkammrennen. The most famous slope on the Hahnenkamm is the classic downhill course, the Streif (streak, or stripe), which is regarded as the most demanding race course on the World Cup circuit. The course features highly technical, "fall-away" turns (reverse bank), many with limited visibility. It also contains several flat gliding sections, immediately preceded by difficult turns, placing a premium on both technical and gliding skills. A run on the mountain's northeast face, the Streif course, is mostly in the shade in January. It is usually overcast and coupled with fog, the result being "flat" lighting which compounds the course's difficulty.

Haier Group Corporation () is a Chinese multinational home appliances and consumer electronics company headquartered in Qingdao, Shandong. It designs, develops, manufactures and sells products including refrigerators, air conditioners, washing machines, microwave ovens, mobile phones, computers, and televisions. The home appliances business, namely Haier Smart Home, has seven global brands – Haier, Casarte, Leader, GE Appliances, Fisher & Paykel, Aqua and Candy. According to data released by Euromonitor, Haier is the number one brand globally in major appliances for 10 consecutive years from 2009 to 2018. The Haier brand was also recognized by BrandZ in 2019 as the most valuable IoT ecosystem brand in the world with a brand value of $16.3 billion. In 2019, Haier Smart Home ranked 448 on Fortune's Global 500 list with a revenue of $27.7 billion. Haier Group also consisted of two listed subsidiaries in three exchanges: Haier Smart Home (SSE: 600690; ex-Qingdao Haier Co., Ltd.), Haier Electronics Group Co., Ltd. (SEHK: 1169), and "D-share" listing of Haier Smart Home in China Europe International Exchange of Frankfurt.

A hair clipper (often individually known by the apparent plural hair clippers in a similar way to scissors) is a specialised implement used to cut human head hair. They work on the same principle as scissors, but are distinct from scissors themselves and razors. Similar but heavier-duty implements are used to shear sheep, but are called handpieces or machine shears.