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A tactile alphabet is a system for writing material that the blind can read by touch. While currently the Braille system is the most popular and some materials have been prepared in Moon type, historically, many other tactile alphabets have existed: Systems based on embossed Roman letters: Moon type; Valentin Haüy's system (in italic style)
Non-printing characters or formatting marks are characters for content designing in word processors, which are not displayed at printing. It is also possible to customize their display on the monitor. The most common non-printable characters in word processors are pilcrow, space, non-breaking space, tab character etc. [1] [2]
For example, dot pattern 1-3-4 describes a cell with three dots raised, at the top and bottom in the left column and at the top of the right column: that is, the letter ⠍ m. The lines of horizontal braille text are separated by a space, much like visible printed text, so that the dots of one line can be differentiated from the braille text ...
Unicode uses the standard dot-numbering 1 to 8. Historically only the 6-dot cell was used in braille. The lower two dots were added later, which explains the irregular numbering 1-2-3-7 in the left column and 4-5-6-8 in the right column. Where dots 7 and 8 are not raised, there is no distinction between 6-dot and 8-dot definitions.
HTML and XML provide ways to reference Unicode characters when the characters themselves either cannot or should not be used. A numeric character reference refers to a character by its Universal Character Set/Unicode code point, and a character entity reference refers to a character by a predefined name.
1494 illustration of a finger alphabet and counting system originally described by Bede in 710. The Greek alphabet is represented, with three additional letters making a total of 27, by the first three columns of numbers. The first two columns are produced on the left hand, and the next two columns on the right.
The Moon alphabet, including some contractions. As with braille, there is a Grade 1 using one Moon character per one Latin character and a Grade 2 using contractions and shorthand that make texts more compact and faster to read, though requiring more study. [3]
Older browsers may not support the latter. NYP letters should only be as wide as their number of dots. However, since 2×3 braille cells are substituted for New York Point in the second row of their table, the one-dot-wide letters e, i, and t are wrongly shown as being as wide as others. The same inaccuracy occurs with the nine, zero, comma ...