Balbis
Encyclopedia
In geometry
Geometry
Geometry arose as the field of knowledge dealing with spatial relationships. Geometry was one of the two fields of pre-modern mathematics, the other being the study of numbers ....

, a balbis is geometric shape that can be colloquially defined as a single (primary) line that is terminated by a (secondary) line at one endpoint and by a (secondary) line at the other endpoint. The terminating secondary lines are at right angles to the primary line. Its parallel sides are of indefinite lengths and can be infinitely long.

The most common example of a balbis is the capital letter 'H
H
H .) is the eighth letter in the basic modern Latin alphabet.-History:The Semitic letter ⟨ח⟩ most likely represented the voiceless pharyngeal fricative . The form of the letter probably stood for a fence or posts....

', the eighth letter in the basic modern Latin alphabet
Basic modern Latin alphabet
The International Organization for Standardization basic Latin alphabet consists of the following 26 letters:By the 1960s it became apparent to the computer and telecommunications industries in the First World that a non-proprietary method of encoding characters was needed...

. The balbis can also be seen in, for example, rugby posts and old-fashioned television antenna.

Another type of balbis is the rectangular balbis, that may be loosely described as a rectangle
Rectangle
In Euclidean plane geometry, a rectangle is any quadrilateral with four right angles. The term "oblong" is occasionally used to refer to a non-square rectangle...

 with one side missing. A rectangular balbis was used in the Olympic Games, as a throwing area and is described by Philostratus II.
An 'H' balbis located in Winchester, Hants.

In his book about the balbis (see References below), the Rev. P. H. Francis describes the balbis as "the commonest geometrical figure, more in evidence than the triangle, circle, ellipse, or other geometrical figure that has been studied from ancient times" and goes on to state that it "was known to but not studied by the ancient Greeks; and this geometrical figure has been neglected."
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