Base code 21 : Dots 1, 2, 4 and 6 Mirror image of letter “n”
Shape Indicator: ( )
This code plays an important role in geometry. For indicating any mathematical shape,
dots 1, 2, 4 & 6 should be inserted before the Braille cell indicating the shape. In shapes,
there are irregular and regular shapes. By regular, we mean the figure where all sides are
equal and by irregular, we mean that at least one side of the figure is unequal with other
sides. For indicating the regular figure, we state the number of sides except for triangle.
Shape indicator and the letter (t) indicate an equilateral triangle in which case all sides
are of same length. For square and figures which have more than 5 sides, the number of
sides should follow the shape indicator for indicating the regular shape. For example,
shape indicator and number (5) will indicate regular pentagon, shape indicator and number
(6) indicates regular hexagon, shape indicator and number (8) indicates regular octagon
and so on. For irregular hexagon, shape indicator should be followed by letters (hx), since
the single letter (h) is used for indicating a “rhombus”. The braille codes for some of the
commonly used geometrical shapes are as follows:
CircleEllipseParallelogramRhombusIs Parallel to ||Right Pointing Arrow →
Is Perpendicular to••
..
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..
- ..
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..
••
••..••
..
-.
-.
-.
••
..
-.
••..
••
..
••
-.
-.
••
..
..
••....
••....
••..
..
-.
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