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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 ?
Hot on the heels of the Beyblade phenomenon that reinvented the spinning top four years ago, B-Daman is set to revolutionise another old favourite - marbles.
Some are shaped like spinning tops, some like acorns, while others have elegant swan-like necks.
Its stock jumped from a low of 440 yen in January to 1,740 yen, the highest so far year, on June 14 due in part to booming sales of toys based on spinning tops and home-use beer dispensers.
Pokemon Challenge puts two players into competition to keep spinning tops in play as long as they can.
BETWEEN GUTIERREZ AND DE LA GUERRA STREETS, A DOZEN SHOPS SELL everything from sarapes, and spinning tops to tamarind ice cream and Canals chewing gum.
He sees two of his friends playing okoso, a favorite game of spinning tops; he meets three women on the way to market.
Like spinning tops, pulsars slow down as they lose energy.
eyecatching Phyllis Kaye with some of the optical toys colourful Richard McCollom (left) and Thomas Havler busy making coloured patterns for spinning tops
The origins of spinning tops are a mystery, but the game is thought to have been set in motion by a child spinning an acorn or nut.
Sam, who attends St John Fisher School, loves having competitions with his mates with the spinning tops. He lives with mum Halina, dad Keith and sister Sophie, six.