Top

A top is a toy designed to be spun rapidly on the ground, the motion of which causes it to remain precisely balanced on its tip because of inertia. Such toys have existed since antiquity. Traditionally tops were constructed of wood, sometimes with an iron tip, and would be set in motion by aid of a string or rope coiled around its axis which, when pulled quickly, caused a rapid unwinding that would set the top in motion. Today they are often built of plastic, and modern materials and manufacturing processes allow tops to be constructed with such precise balance that they can be set in motion by a simple twist of the fingers and twirl of the wrist without need for string or rope.

Characteristics

The motion of a top is produced in the most simple forms by twirling the stem using the fingers. More sophisticated tops are spun by holding the axis firmly while pulling a string or twisting a stick or pushing an auger. In the kinds with an auger, an internal weight rotates, producing an overall circular motion. Some tops can be thrown, while firmly grasping a string that had been tightly wound around the stem, and the centrifugal force generated by the unwinding motion of the string will set them spinning upon touching ground.

Top (clothing)

A top is clothing that covers at least the chest, but which usually covers most of the upper human body between the neck and the waistline. The bottom of tops can be as short as mid-torso, or as long as mid-thigh. Men's tops are generally paired with pants, and women's with pants or skirts. Common types of tops are t-shirts, blouses and shirts.

Design

The neckline is the highest line of the top, and may be as high as a head-covering hood, or as low as the waistline or bottom hem of the top. A top may be worn loose or tight around the bust or waist, and may have sleeves or shoulder straps, spaghetti straps (noodle straps), or may be strapless. The back may be covered or bare. Tops may have straps around the waist or neck, or over the shoulders.

Types

Neck styles

See also

References

External links

Category of topological spaces

In mathematics, the category of topological spaces, often denoted Top, is the category whose objects are topological spaces and whose morphisms are continuous maps or some other variant; for example, objects are often assumed to be compactly generated. This is a category because the composition of two continuous maps is again continuous. The study of Top and of properties of topological spaces using the techniques of category theory is known as categorical topology.

N.B. Some authors use the name Top for the category with topological manifolds as objects and continuous maps as morphisms.

As a concrete category

Like many categories, the category Top is a concrete category (also known as a construct), meaning its objects are sets with additional structure (i.e. topologies) and its morphisms are functions preserving this structure. There is a natural forgetful functor

to the category of sets which assigns to each topological space the underlying set and to each continuous map the underlying function.

Quark (Star Trek)

Quark is a fictional character in the American television series Star Trek: Deep Space Nine. The character, which was played by Armin Shimerman, was depicted as a member of an extraterrestrial race known as the Ferengi, who are stereotypically capitalist and motivated only by profit.

Quark, who often served as the show's comedy relief, may have been named after the 1978 Quark (TV series), which frequently examined science fiction themes from a humorous or satirical perspective.

Career

List of Doctor Who robots

The long-running British science fiction television series Doctor Who has featured many robots. The Daleks and Cybermen are not listed as they are organic beings that become cyborgs and therefore not true robots.

A

Adherents of the Repeated Meme

Robots that worked for Lady Cassandra and were defeated by the Ninth Doctor. As the Doctor points out, "repeated meme" is just another way of saying "idea". Their jobs was to distribute spheres housing the spider-like robots that infiltrated the systems of Platform One, and sabotage it.

Advertising satellite

A small robot that delivers junk mail to advertise events, as in The Greatest Show in the Galaxy. The advertising satellite was able to use the TARDIS' viewing screen to show the advertisement. It has some degree of sentience as it took insult to Ace's commit about it being junk mail.

Androids (Androzani)

Androids created by Sharaz Jek. They are perfectly duplicates of the person they are modeled after, hence why the originals must be gotten out of the way.

Quark (magazine)

Quark was an American science magazine in the 1970s.

References