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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 ?
New York City Dance Alliance's closing night gala topped off a five-day marathon of workshops and preliminary competitions.
What's worrisome is the high loan to value and adjustable rate piggyback first liens burdened with super-high revolving variable rate home equity line of credit seconds ("HELOC") (Calhoun, PhD) topped off with abusive prepayment penalties, running naked without mortgage insurance.
Construction is underway and the building will be topped off by year end.
The ceremony topped off a day of celebration for dozens of activists, environmentalists and politicians who helped stop a proposed 3,050-home development and preserve the 2,800 acres of rolling hills as open space.
This positive growth was topped off by further launches of wide bandgap materials products for the commercial sector.
The evening was topped off by the rocking New York Real Estate All-Star Band.