A **ship** is a large buoyant watercraft. Ships are generally distinguished from boats based on size, shape and cargo or passenger capacity. Ships are used on lakes, seas,rivers,and oceans for a variety of activities, such as the transport of people or goods, fishing, entertainment, public safety, and warfare. Historically, a "ship" was a sailing vessel with at least three square-rigged masts and a full bowsprit.

In armed conflict and in daily life, ships have become an integral part of modern commercial and military systems. Fishing boats are used by millions of fishermen throughout the world. Military forces operate vessels for naval warfare and to transport and support forces ashore. Commercial vessels, nearly 35,000 in number, carried 7.4 billion tons of cargo in 2007. As of 2011, there are about 104,304 ships with IMO numbers in the world.

Ships were always a key in history's great explorations and scientific and technological development. Navigators such as Zheng He spread such inventions as the compass and gunpowder. Ships have been used for such purposes as colonization and the slave trade, and have served scientific, cultural, and humanitarian needs. After the 16th century, new crops that had come from and to the Americas via the European seafarers significantly contributed to the world population growth.Ship transport has shaped the world's economy into today's energy-intensive pattern.

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A **ship** is a large vessel that floats on water, specifically the ocean and the sea.

**Ship** or **ships** may also refer to:

**Acronyms:**

**In the arts:**

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The fictional A.I. entity originally known as **Ship** has appeared in several incarnations in the Marvel Universe. At times controlled by both the X-Men and their enemies, the sentient A.I. has at times been installed in the core of a Celestial starship, two space stations, and a techno-organic being. It is not related to Star-Lord's "Ship".

Ship's A.I. was created untold millennia ago by the Celestials as the operating system for a data collection device. The Celestials had genetically manipulated humanity, and they left the Ship in the area that would come to be known as Mongolia to monitor humanity's progress.

Circa 1100 A.D., a Mongolian immortal known as Garbha-Hsien (later known as Saul), discovered the Ship and lived next to it while he researched its mysteries. Saul never attempted to enter the Ship.

In time, the Egyptian immortal En Sabah Nur learned of Saul and sought him out as another immortal. In a confrontation, En Sabah Nur slew all of Saul's guards. Saul then sought to humble his fellow "forever-walker" by revealing the secret titanic vessel. Having had previous experience with futuristic technology due to his encounters with Rama-Tut, Nur attacked Saul and left the other immortal for dead and entered the Ship. He emerged later as a vastly changed being who now called himself Apocalypse.

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**Metric** or **metrical** may refer to:

- Schwarzschild metric, a description of the geometry around a special type of black hole

- International System of Units, or
*Système International*(SI), the modern form of the metric system - Metric tonne, a measurement of mass equal to 1,000 kg

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In differential geometry, the notion of a metric tensor can be extended to an arbitrary vector bundle. Specifically, if *M* is a topological manifold and *E* → *M* a vector bundle on *M*, then a metric (sometimes called a bundle metric, or fibre metric) on *E* is a bundle map *g* : *E* ×_{M}*E* → *M* × **R** from the fiber product of *E* with itself to the trivial bundle with fiber **R** such that the restriction of *g* to each fibre over *M* is a nondegenerate bilinear map of vector spaces.

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In mathematics, a **metric** or **distance function** is a function that defines a distance between each pair of elements of a set. A set with a metric is called a metric space. A metric induces a topology on a set, but not all topologies can be generated by a metric. A topological space whose topology can be described by a metric is called metrizable.

In differential geometry, the word "metric" may refer to a bilinear form that may be defined from the tangent vectors of a differentiable manifold onto a scalar, allowing distances along curves to be determined through integration. It is more properly termed a metric tensor.

A **metric** on a set *X* is a function (called the *distance function* or simply **distance**)

where [0,∞) is the set of **non-negative** real numbers (because distance can't be negative so we can't use **R**), and for all *x*, *y*, *z* in *X*, the following conditions are satisfied:

Conditions 1 and 2 together define a *positive-definite function*.
The first condition is implied by the others.

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