All articles A–Z

Hjalmar Johansson

Hjalmar Johansson (Carl August Hjalmar Johansson, 1874–1957), Swedish diver and swimmer; 1908 Olympic platform diving gold medalist, 1912 plain high diving silver medalist, FINA founding contributor, ISHOF inductee 1982.

Hjalmar Karlsson

Hjalmar Karlsson (Ernst Hjalmar Karlsson), Swedish sailor born 1906 in Örebro, died 1992 in Ekerö; Olympic gold in the 5.5 metre class at Melbourne 1956 aboard Rush V with Lars Thörn and Sture Stork; father of Olympians Per-Olof and Arne Karlsson.

Hjalmar Levin

Hjalmar Levin (John Gustaf Hjalmar Levin, 1884–1983) was a Swedish road cyclist from Eskilstuna and VoIF Diana co-founder who competed as a non-scoring entrant in the 1912 Stockholm Olympics team road race.

Oct 10, 2026

Hjalmar Mellin

Hjalmar Mellin, full name Robert Hjalmar Mellin, was a Finnish mathematician (1854–1933) who gave the Mellin transform its first systematic formulation and applied it to the Riemann zeta function.

Sep 19, 2026

Hjalmar Nilsonne

Hjalmar Nilsonne (born 1986) is a Swedish engineer and entrepreneur, co-founder and CEO of Neko Health, the Stockholm health-scanning company he started with Daniel Ek in 2018.

Hjalmar Schacht

Hjalmar Schacht (1877–1970) was a German banker who stabilized the mark after the 1923 hyperinflation, twice served as Reichsbank president, financed Nazi rearmament as economics minister, and was acquitted at Nuremberg.

Oct 22, 2026

Hjalmar Söderberg

Hjalmar Söderberg (1869–1941) was a Swedish novelist, playwright, and translator regarded as a major early twentieth-century Swedish author, best known for Doktor Glas and his portraits of Stockholm.

Sep 19, 2026

Hjalmar Winbladh

Hjalmar Winbladh is a Swedish technology entrepreneur who co-founded the music-licensing platform Epidemic Sound in Stockholm in 2009 and was nominated as its Chairperson in 2025.

Hjordis Nordin

Hjördis Nordin (Hjördis Margareta Nordin, later Hallqvist), Swedish gymnast born 2 August 1932 in Lund; Olympic gold in team portable apparatus at Helsinki 1952 (74.20) and world team gold at Basel 1950.

HJV

HJV (hemojuvelin BMP co-receptor, HFE2, RGMC) is a human gene on chromosome 1q21.1 encoding hemojuvelin, a GPI-anchored BMP co-receptor that drives hepcidin production; HJV mutations cause autosomal recessive type 2A juvenile hemochromatosis, most often G320V.

HK 4.6×30mm

The HK 4.6×30mm, or Heckler & Koch 4.6×30mm, is a small-caliber, high-velocity bottlenecked cartridge developed by Heckler & Koch in 1999 for the MP7 personal defense weapon, designed to penetrate body armor.

HK Electric Investments

HK Electric Investments is a Hong Kong-listed investment trust holding The Hongkong Electric Company, the utility supplying electricity to Hong Kong Island, Ap Lei Chau, and Lamma.

HK Express

HK Express, also known as Hong Kong Express Airways, is a Hong Kong low-cost airline serving over 30 Asian cities from its hub at Hong Kong International Airport.

HK Systems

HK Systems was a North American supplier of warehouse automation equipment and logistics software, headquartered in New Berlin, Wisconsin, and acquired by Dematic Group in 2010.

HK-47

HK-47 is the fictional Hunter-Killer assassin droid built by Darth Revan in Star Wars: Knights of the Old Republic (2003), voiced by Kristoffer Tabori, written by David Gaider, and known for calling organics "meatbags."

HK1

HK1 (hexokinase 1, 10q22.1) encodes the ubiquitous hexokinase that phosphorylates glucose to glucose-6-phosphate, the rate-limiting first step of glycolysis; silenced in beta-cells, its cis-regulatory variants cause congenital hyperinsulinism.

Oct 20, 2026

Hkakabo Razi

Hkakabo Razi (ခါကာဘိုရာဇီ), 5,881 m, is Myanmar's and traditionally Southeast Asia's highest peak, in Kachin State at the eastern Himalaya's end. First climbed by Takashi Ozaki and Nyima Gyaltsen in 1996; its height is disputed with nearby GPS-measured Gamlang Razi (5,870 m).

Oct 20, 2026

Hkaru Bum

Hkaru Bum (ခရုဘမ်း) is a 3,657 m mountain in Kawnglanghpu Township, Putao District, Kachin State, Myanmar; GeoNames ranks it Myanmar's second highest peak after Hkakabo Razi, and it is the highest point of the Triangle range.

HKE (power utility)

The Hongkong Electric Company, also known as HK Electric, is one of Hong Kong's two investor-owned power companies, serving Hong Kong Island, Ap Lei Chau, and Lamma since 1890.

HKMG

HKMG (high-κ metal gate) is a transistor technology replacing silicon dioxide gates with a hafnium oxide dielectric and metal electrodes, first used by Intel at 45 nm in 2007.

HKN Energy Ltd

HKN Energy Ltd is a private oil and gas exploration and production company, incorporated in the Cayman Islands, that operates the Sarsang and Atrush blocks in Iraqi Kurdistan.

HKUST-1

HKUST-1, also known as MOF-199, is a porous copper-based metal-organic framework first reported in 1999 by researchers at the Hong Kong University of Science and Technology.

HL Tau

HL Tau (HL Tauri) is a young, still-forming T Tauri star about 450 light-years from Earth in the constellation Taurus, with one of the most studied protoplanetary disks known.

HL-1M

HL-1M was a medium-sized Chinese tokamak operated at the Southwestern Institute of Physics in Chengdu from 1994, created by upgrading the earlier HL-1 tokamak; its experiments formed the basis for the successor device HL-2A.

HL-2A

HL-2A is a medium-sized divertor tokamak at the Southwestern Institute of Physics in Chengdu, China, built partly from the former German ASDEX tokamak, with first plasma in 2002.

HL-2M

HL-2M, officially renamed HL-3, is a medium-sized copper-conductor tokamak built by the Southwestern Institute of Physics in Chengdu, achieving its first plasma in December 2020.

HL-3

HL-3 (中国环流三号), formerly known as HL-2M, is a tokamak at the Southwestern Institute of Physics in Chengdu, China, that reached electron temperatures above 160 million degrees.

HL-60 (HL60)

HL-60 (HL60, Human Leukemia-60) is a human promyelocytic leukemia cell line established in 1977 from a 36-year-old woman's peripheral blood, later classified FAB-M2 AML; a standard model for myeloid differentiation and neutrophil research.

HL-GA Battery Company LLC

HL-GA Battery Company LLC is a Hyundai Motor Group and LG Energy Solution joint venture formed in 2023 to build a 30 GWh battery cell plant in Bryan County, Georgia.