top

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top,

toy with a tapering point on which it can be made to spin. Tops were known in antiquity and appeared in Europe during the Middle Ages; they are used today in many different regions of the world by both primitive and advanced societies. The principle of its motion is utilized in the gyroscopegyroscope
, symmetrical mass, usually a wheel, mounted so that it can spin about an axis in any direction. When spinning, the gyroscope has special properties. Many spinning objects exhibit some of these properties; the rotation of the earth about its axis gives it the
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.

top

[täp]
(geology)
(mechanics)
A rigid body, one point of which is held fixed in an inertial reference frame, and which usually has an axis of symmetry passing through this point; its motion is usually studied when it is spinning rapidly about the axis of symmetry.
(particle physics)
The new quantum number associated with the top quark. Also known as truth.
(quantum mechanics)

top

1. short for top gear
2. Cards the highest card of a suit in a player's hand
3. a platform around the head of a lower mast of a sailing vessel, the edges of which serve to extend the topmast shrouds
4. Chem the part of a volatile liquid mixture that distils first
5. the high-frequency content of an audio signal

TOP

TOP

(Technical Office Protocol) A communications protocol for office systems developed in the early 1980s by the Computer Services division of Boeing in Seattle, WA. It is often used in conjunction with MAP, the factory automation protocol developed by GM. TOP is used in the front office, and MAP is used on the factory floor. TOP uses the CSMA/CD access method (Ethernet), while MAP uses token bus.
References in periodicals archive ?
Tops and diabolos were introduced to Europe in 1700 and many villages kept a large spinning top in the square.
The latest craze this year is Beyblades which are really a throwback to spinning tops of yesteryear.
Beyblades: Since the launch of the television series on Cartoon Network the battling spinning tops fly off toyshop shelves as soon as they're stacked Astrojax: Popular in the playground, this yo-yo/jacks hybrid is great for doing tricks with and, despite a slow start, is gaining popularity Micropets: Tiny robotic dogs, cats and bears are following in the wake of the Tamagotchis Harry Potter: Still flying high as his Nimbus 2000, Harry continues to be a big hit after the launch of The Chamber of Secrets.
The trip down memory lane begins at the turn of the 20th century, with traditional toys like the yo-yo, spinning tops and the advent of Meccano.
Depending on ages, challenges included inventing helicopters (see the sample solutions in the sidebar), spinning tops, sundials, devices for measuring force and devices to monitor air temperature changes.
Aren't they those cheap plastic spinning tops kids play with this time of year?
Basically, nuclear magnetic resonance works because atoms placed in a very strong magnetic field align with the field and behave as though they were spinning tops.
From Canada to Australia, kids have discovered the excitement of BEYBLADE, the brand of high performance spinning tops that you build and battle, and they are quickly making it one of the most sought-after toys for this holiday season.
Kids can play old toys like hupla, skittles and spinning tops, and there's a pony cart ride, a tram, forge, lime kilns and a chance to go underground in a coal mine.
SPINNING tops that fight each other were yesterday named the Toy of 2002.