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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 ?
MEPs agreed that programme member states should continue to be eligible for top ups until 30 June of the year following the calendar year in which they cease receiving financial assistance under an economic adjustment programme.
13), messages and top ups for free, and numbers which can be called for free for life, are some of the weapons being used by telephone operators to attract new users.
But some form of assistance or top ups so that we can keep these players in Wales would be most welcomed by myself and Justin (Burnell).
Tension in the cotton industry over the prices for seed cotton has reached boiling point with farmers expressing growing concern at being paid the minimum price of US$0,85 per kilogramme and doubting the promise by merchants to pay them top ups when the crop is graded.