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0 (zero) is a number representing an empty quantity. Adding (or subtracting) 0 to any number leaves that number unchanged; in mathematical terminology, 0 is the additive identity of the integers, rational numbers, real numbers, and complex numbers, as well as other algebraic structures. Multiplying any number by 0 results in 0, and consequently division by zero has no meaning in arithmetic.

As a numerical digit, 0 plays a crucial role in decimal notation: it indicates that the power of ten corresponding to the place containing a 0 does not contribute to the total. For example, "205" in decimal means two hundreds, no tens, and five ones. The same principle applies in place-value notations that uses a base other than ten, such as binary and hexadecimal. The modern use of 0 in this manner derives from Indian mathematics that was transmitted to Europe via medieval Islamic mathematicians and popularized by Fibonacci. It was independently used by the Maya.

Common names for the number 0 in English include zero, nought, naught (), and nil. In contexts where at least one adjacent digit distinguishes it from the letter O, the number is sometimes pronounced as oh or o (). Informal or slang terms for 0 include zilch and zip. Historically, ought, aught (), and cipher have also been used.

Eleven or 11 may refer to:

• 11 (number)
• One of the years 11 BC, AD 11, 1911, 2011

Fourteen or 14 may refer to:

• 14 (number), the natural number following 13 and preceding 15
• one of the years 14 BC, AD 14, 1914, 2014

2 (two) is a number, numeral and digit. It is the natural number following 1 and preceding 3. It is the smallest and the only even prime number.

Because it forms the basis of a duality, it has religious and spiritual significance in many cultures.

5 (five) is a number, numeral and digit. It is the natural number, and cardinal number, following 4 and preceding 6, and is a prime number.

Humans, and many other animals, have 5 digits on their limbs.

54 may refer to:

• 54 (number)
• one of the years 54 BC, AD 54, 1954, 2054
• 54 (novel), a 2002 novel by Wu Ming
• Studio 54, a New York City nightclub from 1977 until 1981
• 54 (film), a 1998 American drama film about the club
• 54 (album), a 2010 album by Metropole Orkest
• "Fifty Four", a song by Karma to Burn from the album Arch Stanton, 2014
• 54th Division (disambiguation)
• 54th Regiment of Foot (disambiguation)
• 54th Infantry (disambiguation)
• 54 Alexandra, a main-belt asteroid
• Tatra 54, an automobile

6 (six) is the natural number following 5 and preceding 7. It is a composite number and the smallest perfect number.

Year 802 (DCCCII) was a common year starting on Saturday of the Julian calendar, the 802nd year of the Common Era (CE) and Anno Domini (AD) designations, the 802nd year of the 1st millennium, the 2nd year of the 9th century, and the 3rd year of the 800s decade.

A514 may refer to :

• A514 road (Great Britain)
• A514 steel
• Werra (A514), a 1993 Elbe class replenishment ship built in the Flensburger Schiffbau-Gesellschaft

Acer often refers to:

• Acer (plant), the genus of trees and shrubs commonly known as maples
• Acer Inc., a computer company in Taiwan

Acer may also refer to:

Full may refer to:

• People with the surname Full, including:
  • Mr. Full (given name unknown), acting Governor of German Cameroon, 1913 to 1914
• A property in the mathematical field of topology; see Full set
• A property of functors in the mathematical field of category theory; see Full and faithful functors
• Satiety, the absence of hunger
• A standard bed size, see Bed
• Fulling, also known as tucking or walking ("waulking" in Scotland), term for a step in woollen clothmaking (verb: to full)
• Full-Reuenthal, a municipality in the district of Zurzach in the canton of Aargau in Switzerland

Gen is most commonly seen as a contraction (such as Gen.) and it may refer to:

• Book of Genesis
• General officer
• Generation#Western world as in GenX, GenZ, etc.
• Genitive case

Gen may also refer to:

• Gen (film), 2006 Turkish horror film directed by Togan Gökbakar
• Gen_, a documentary 2025 film
• Gen (Street Fighter), a video game character from the Street Fighter series
• Gen Fu, a video game character from the Dead or Alive series
• Gen language, a language of Togo
• Gen-san, a character in the anime series Sky Girls
• Gen Asagiri (あさぎり ゲン (浅霧 幻)), a character in the anime and manga series Dr. Stone
• Gen Tomii (富井 彦, born 1973), Japanese Nordic combined skier
• Gen Hoshino (星野 源, born 1981), Japanese singer-songwriter, musician, actor, and writer
• Gen Kitchen, British politician
• Gen Shoji (昌子 源, born 1992), Japanese footballer
• Gen Urobuchi (虚淵 玄, born 1972), Japanese novelist, visual novel writer and anime screenwriter
• Gen Fukunaga (福永 元, born 1962), Japanese engineer and businessman
• Gen Nakatani (中谷 元, born 1957), Japanese politician
• Gen Horiuchi (堀内 元), Japanese ballet dancer and choreographer
• Gen Digital, a computer security software company in United States

GEN may refer to:

• GEN Corporation, of Japan
• GEN, Global Enterprise Network, a UK Internet Service Provider
• GEN Energija, a state-owned power company in Slovenia
• GEN, a website published by Medium
• Global Ecovillage Network
• Global Editors Network
• Gewestelijk ExpresNet, Dutch name for the Brussels Regional Express Network, a commuter rail service

Gold is a chemical element; it has chemical symbol Au (from Latin aurum) and atomic number 79. In its pure form, it is a bright, slightly orange-yellow, dense, soft, malleable, and ductile metal. Chemically, gold is a transition metal, a group 11 element, and one of the noble metals. It is one of the least reactive chemical elements, being the second-lowest in the reactivity series. It is solid under standard conditions.

Gold often occurs in free elemental (native state), as nuggets or grains, in rocks, veins, and alluvial deposits. It occurs in a solid solution series with the native element silver (as in electrum), naturally alloyed with other metals like copper and palladium, and mineral inclusions such as within pyrite. Less commonly, it occurs in minerals as gold compounds, often with tellurium (gold tellurides).

Gold is resistant to most acids, though it does dissolve in aqua regia (a mixture of nitric acid and hydrochloric acid), forming a soluble tetrachloroaurate anion. Gold is insoluble in nitric acid alone, which dissolves silver and base metals, a property long used to refine gold and confirm the presence of gold in metallic substances, giving rise to the term 'acid test'. Gold dissolves in alkaline solutions of cyanide, which are used in mining and electroplating. Gold also dissolves in mercury, forming amalgam alloys, and as the gold acts simply as a solute, this is not a chemical reaction.

A relatively rare element, gold is a precious metal that has been used for coinage, jewelry, and other works of art throughout recorded history. In the past, a gold standard was often implemented as a monetary policy. Gold coins ceased to be minted as a circulating currency in the 1930s, and the world gold standard was abandoned for a fiat currency system after the Nixon shock measures of 1971.

In 2023, the world's largest gold producer was China, followed by Russia and Australia. As of 2020, a total of around 201,296 tonnes of gold exist above ground. This is equal to a cube, with each side measuring roughly 21.7 meters (71 ft). The world's consumption of new gold produced is about 50% in jewelry, 40% in investments, and 10% in industry. Gold's high malleability, ductility, resistance to corrosion and most other chemical reactions, as well as conductivity of electricity have led to its continued use in corrosion-resistant electrical connectors in all types of computerized devices (its chief industrial use). Gold is also used in infrared shielding, the production of colored glass, gold leafing, and tooth restoration. Certain gold salts are still used as anti-inflammatory agents in medicine.