J. Sussman, Inc. is a family business established in 1906 that manufactures custom windows and specializes in aluminum extrusions for the stained and leaded art glass trade. The business is also known for bending aluminum and glass. It is located in Jamaica, Queens, a neighborhood of New York City. J. Sussman, Inc. relies on solar energy to power its factory. They have one of the largest solar panel installations in the Queens area.

A jack, screwjack or jackscrew is a mechanical device used as a lifting device to lift heavy loads or to apply great forces. A mechanical jack employs a screw thread for lifting heavy equipment. A hydraulic jack uses hydraulic power. The most common form is a car jack, floor jack or garage jack, which lifts vehicles so that maintenance can be performed. Jacks are usually rated for a maximum lifting capacity (for example, 1.5 tons or 3 tons). Industrial jacks can be rated for many tons of load.

A jack-o'-lantern (or jack o'lantern) is a carved pumpkin, turnip, or other root vegetable lantern, associated with the holiday of Halloween and named after the phenomenon of a strange light flickering over peat bogs, called will-o'-the-wisp or jack-o'-lantern. It's name is also tied to the Irish legend of Stingy Jack, a drunkard who bargains with Satan and is doomed to roam the Earth with only a hollowed turnip to light his way. Jack-o'-lantern's are a yearly Halloween tradition that came to America from Irish immigrants. In a jack-o'-lantern, the top of the pumpkin or turnip is cut off to form a lid, the inside flesh is scooped out, and an image — usually a monstrous or comical face – is carved out of the rind to expose the hollow interior. To create the lantern effect, a light source is placed within before the lid is closed. The light source is traditionally a flame such as a candle or tea light, but artificial jack-'o-lanterns with electric lights are also marketed. It is common to see jack-o'-lanterns on doorsteps and otherwise used as decorations prior to and on Halloween.

A jackscrew is a type of jack that is operated by turning a leadscrew. In the form of a screw jack it is commonly used to lift moderately heavy weights, such as vehicles. More commonly it is used as an adjustable support for heavy loads, such as the foundations of houses, or large vehicles. These can support a heavy load, but not lift it.

The "Jacob's ladder" is a type of pocketknife consisting of two handle segments joined by a pivot, with a blade connected by a second pivot to the end of one handle segment.The design presumably takes its name from the multi-jointed wooden toy also known as a Jacob's ladder, which is itself named after the ladder to heaven witnessed by the biblical patriarch Jacob (Genesis 28:12).

Jacuzzi is a corporation that today produces toilets, whirlpool bathtubs, and hot tub spas. Its first product was a portable hydrotherapy unit that sat in the bath. Later, the jet that was used in the portable unit was incorporated into the wall of a swimming pool and later adapted to the wall of a fiberglass bath tub. JACUZZI is a federally registered trademark of Jacuzzi Inc. as of September 5, 1978.

Jade is an ornamental mineral, mostly known for its green varieties, which is featured prominently in ancient Asian art. The term jade is applied to two different minerals: Nephrite consists of a microcrystalline interlocking fibrous matrix of the calcium, magnesium-iron rich amphibole mineral series tremolite (calcium-magnesium)-ferroactinolite (calcium-magnesium-iron). The middle member of this series with an intermediate composition is called actinolite (the silky fibrous mineral form is one form of asbestos). The higher the iron content, the greener the colour. Jadeite is a sodium- and aluminium-rich pyroxene. The precious form of jadeite jade is a microcrystalline interlocking growth of jadeite crystals.

Jagdpanzer (JgPz), (German: "hunting tank"), is a name given to German self-propelled anti-tank guns. It typically refers to anti-tank variants of existing tank chassis with a well-armoured casemate fixed superstructure, mounting an anti-tank gun with limited traverse in the front, and usually classed by the western Allies of World War II as a tank destroyer.

The jaguar (Panthera onca) is a large felid species and the only extant member of the genus Panthera native to the Americas. The jaguar's present range extends from Southwestern United States and Mexico in North America, across much of Central America, and south to Paraguay and northern Argentina in South America. Though there are single cats now living within the Western United States, the species has largely been extirpated from the United States since the early 20th century. It is listed as Near Threatened on the IUCN Red List; and its numbers are declining. Threats include loss and fragmentation of habitat. Overall, the jaguar is the largest native cat species of the New World and the third largest in the world. This spotted cat closely resembles the leopard, but is usually larger and sturdier. It ranges across a variety of forested and open terrains, but its preferred habitat is tropical and subtropical moist broadleaf forest, swamps and wooded regions. The jaguar enjoys swimming and is largely a solitary, opportunistic, stalk-and-ambush predator at the top of the food chain. As a keystone species it plays an important role in stabilizing ecosystems and regulating prey populations. While international trade in jaguars or their body parts is prohibited, the cat is still frequently killed, particularly in conflicts with ranchers and farmers in South America. Although reduced, its range remains large. Given its historical distribution, the jaguar has featured prominently in the mythology of numerous indigenous American cultures, including those of the Maya and Aztec.

Jaguar (UK English: JAG-ew-ər, US English: JAG-wɑɹ) is the luxury vehicle brand of Jaguar Land Rover, a British multinational car manufacturer with its headquarters in Whitley, Coventry, England, owned by the Indian company Tata Motors since 2008. Jaguar's business was founded as the Swallow Sidecar Company in 1922, originally making motorcycle sidecars before developing bodies for passenger cars. Under the ownership of S. S. Cars Limited the business extended to complete cars made in association with Standard Motor Co, many bearing Jaguar as a model name. The company's name was changed from S. S. Cars to Jaguar Cars in 1945. A merger with the British Motor Corporation followed in 1966, the resulting enlarged company now being renamed as British Motor Holdings (BMH), which in 1968 merged with Leyland Motor Corporation and became British Leyland, itself to be nationalised in 1975. Jaguar was de-merged from British Leyland and was listed on the London Stock Exchange in 1984, becoming a constituent of the FTSE 100 Index until it was acquired by Ford in 1990. Jaguar has, in recent years, manufactured cars for the British Prime Minister, the most recent delivery being an XJ in May 2010. The company also holds royal warrants from Queen Elizabeth II and Prince Charles. Jaguar cars today are designed in Jaguar Land Rover's engineering centres at the Whitley plant in Coventry and at their Gaydon site in Warwickshire, and are assembled in their plants at Castle Bromwich and Solihull. In September 2013 Jaguar Land Rover announced plans to open a 100 million GBP (160 million USD) research and development centre in the University of Warwick, Coventry to create a new generation of vehicle technologies. The carmaker said around 1,000 academics and engineers would work there and that construction would start in 2014.