Characterized by the use of three computer words to represent a number in accordance with required precision.

A byte composed of three bits. Synonym three-bit byte.

In a given trichromatic system, the amounts of the three reference color stimuli required to match the light considered in a given chromatic system. [After IEEE]

1. An apparently harmless program containing malicious logic that allows the unauthorized collection, falsification, or destruction of data. [2382-pt.8]
2. [A] program containing hidden code allowing the unauthorized collection, falsification, or destruction of information. [INFOSEC-99]
3. A computer program with an apparently or actually useful function that contains additional (hidden) functions that surreptitiously exploit the legitimate authorizations of the invoking… (Read More →)

Synonym tropospheric scatter.

1. The lower layers of atmosphere, in which the change of temperature with height is relatively large. It is the region where clouds form, convection is active, and mixing is continuous and more or less complete. [JP1]
2. The layer of the Earth's atmosphere, between the surface and the stratosphere, in which temperature decreases with altitude and which contains approximately… (Read More →)

See atmospheric duct.

1. The propagation of radio waves by scattering as a result of irregularities or discontinuities in the physical properties of the troposphere. [NTIA] [RR] [JP1]
2. A method of transhorizon communications using frequencies from approximately 350 MHz to approximately 8400 MHz.
Note: The propagation mechanism is still not fully understood, though it includes several distinguishable but changeable mechanisms such as… (Read More →)

A radio wave that is propagated by reflection from a place of abrupt change in the dielectric constant, or its gradient, in the troposphere.
Note: In some cases, a ground wave may be so altered that new components appear to arise from reflection in regions of rapidly changing dielectric constant. When these components are distinguishable from the other components, they… (Read More →)

Synonym effective power.