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	Eng ID	Term	Definition
	481	bifurcation	A division into two branches.
	482	bifurcation buoy	See BUOY: BIFURCATION.
	483	bight	A bend or curve in the COASTLINE, a bend in a RIVER, etc. In ice terminology, an extensive crescent-shaped indentation in the ICE EDGE forme... more A bend or curve in the COASTLINE, a bend in a RIVER, etc. In ice terminology, an extensive crescent-shaped indentation in the ICE EDGE formed either by WIND or CURRENT.
	484	Bilby steel tower	A demountable and transportable TRIANGULATION TOWER for elevating a THEODOLITE and LUMINOUS SIGNALS above the GROUND, designed by J.S. Bilby... more A demountable and transportable TRIANGULATION TOWER for elevating a THEODOLITE and LUMINOUS SIGNALS above the GROUND, designed by J.S. Bilby, USC&GS.
	485	billow	A great WAVE.
	486	binary	The number system using 2 as the base for number representation. Binary numbers are composed of BITS. Generally any element capable of only ... more The number system using 2 as the base for number representation. Binary numbers are composed of BITS. Generally any element capable of only two mutually exclusive states is called binary.
	487	binnacle	The stand in which a COMPASS is mounted and in which lighting and compensatory units are carried.
	488	binocular(s)	An optical instrument consisting of a pair of TELESCOPES joined so as to be adaptable to the use of both eyes simultaneously.
	489	binocular vision	Simultaneous vision with both eyes.
	490	biology: marine	The study of the life, history and ECOLOGY of marine and brackish water plants and animals.
	491	bioluminescence	The emission of light by living organisms. See also NOCTILUCA.
	492	biosphere	Spherical terrestrial LAYER comprising the lower part of the ATMOSPHERE, the SEAS and the upper LAYERS of the SOIL within which living organ... more Spherical terrestrial LAYER comprising the lower part of the ATMOSPHERE, the SEAS and the upper LAYERS of the SOIL within which living organisms can exist naturally.
	493	bissextile year	See YEAR: CIVIL.
	494	bit	Short for "binary digit", the digit in binary number representation. A bit can only assume the binary values "0" and "1". A binary number re... more Short for "binary digit", the digit in binary number representation. A bit can only assume the binary values "0" and "1". A binary number representation is composed of bits just as a decimal number is represented by decimal digits. A unit of 8 bits is called a BYTE. It also stands for "basic indissoluble information unit", a unit used for measuring the information content in information theory.
	495	blind rollers	Long, high SWELLS which have increased in HEIGHT, almost to the breaking point, as they pass over SHOALS or run in shoaling water. Called bl... more Long, high SWELLS which have increased in HEIGHT, almost to the breaking point, as they pass over SHOALS or run in shoaling water. Called blind seas in some localities.
	496	blind seas	See BLIND ROLLERS.
	497	blind zone	An area within or from which little or no radio SIGNAL is received. Also called zone of silence.
	498	blip	Indication of a SIGNAL on the SCOPE of an electronic instrument, produced by a short sharply-peaked PULSE of voltage.
	499	blizzard	Violent and very cold WIND which is laden with SNOW, some part, at least, of which has been raised from snow-covered GROUND. This term origi... more Violent and very cold WIND which is laden with SNOW, some part, at least, of which has been raised from snow-covered GROUND. This term originated in North America but has been extended to include similar WINDS in other countries.
	500	block correction	See CHARTLET.
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