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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 ?
And the free Happy-Ending(R) size sundae that tops off each of the six featured meals offers the perfect way to extend the fun for adults and kids alike.
A flicker switch perched atop his head tops off the play by adding great sound effects.
In a teleconference call from the Chicago Stock Exchange, Harrigan said of the embattled NYSE, "The only thing that has happened at the NYSE up until now was cutting the tops off of the dandelions.