Braille

The Braille code where the word

⠏⠗⠑⠍⠊⠑⠗

(premier, French for "first") can be read.

Braille was based on a tactile military code called night writing, developed by Charles Barbier in response to Napoleon's demand for a means for soldiers to communicate silently at night and without a light source.[5] In Barbier's system, sets of 12 embossed dots encoded 36 different sounds. It proved to be too difficult for soldiers to recognize by touch and was rejected by the military. In 1821 Barbier visited the Royal Institute for the Blind in Paris, where he met Louis Braille. Braille identified two major defects of the code: first, by representing only sounds, the code was unable to render the orthography of the words; second, the human finger could not encompass the whole 12-dot symbol without moving, and so could not move rapidly from one symbol to another. Braille's solution was to use 6-dot cells and to assign a specific pattern to each letter of the alphabet.[6] At first, Braille was a one-to-one transliteration of French orthography, but soon various abbreviations, contractions, and even logograms were developed, creating a system much more like shorthand.[7] The expanded English system, called Grade-2 Braille, was completed by 1905. For blind readers, Braille is an independent writing system, rather than a code of printed orthography.[8]

Derivation

Braille is derived from the Latin alphabet, albeit indirectly. In Braille's original system, the dot patterns were assigned to letters according to their position within the alphabetic order of the French alphabet, with accented letters and w sorted at the end.[9]

The first ten letters of the alphabet, a–j, use the upper four dot positions: ⠁⠃⠉⠙⠑⠋⠛⠓⠊⠚ (black dots in the table below). These stand for the ten digits 1–9 and 0 in an alphabetic numeral system similar to Greek numerals (as well all derivations of it, including Hebrew numerals, Cyrillic numerals, Abjad numerals, also Hebrew gematria and Greek isopsephy).

Though the dots are assigned in no obvious order, the cells with the fewest dots are assigned to the first three letters (and lowest digits), abc = 123 (⠁⠃⠉), and to the three vowels in this part of the alphabet, aei (⠁⠑⠊), whereas the even digits, 4, 6, 8, 0 (⠙⠋⠓⠚), are corners/right angles.

The next ten letters, k–t, are identical to a–j, respectively, apart from the addition of a dot at position 3 (red dots in the table below): ⠅⠇⠍⠝⠕⠏⠟⠗⠎⠞:

Derivation (colored dots) of the 26 braille letters of the Basic Latin alphabet
from the 10 numeric digits (black dots)

a/1	b/2	c/3	d/4	e/5	f/6	g/7	h/8	i/9	j/0
k	l	m	n	o	p	q	r	s	t
u	v	x	y	z					w

The next ten letters (the next "decade") are the same again, but with dots also at both position 3 and position 6 (green dots in the table above). Here w was left out as not being a part of the official French alphabet at the time of Braille's life; the French braille order is u v x y z ç é à è ù (⠥⠧⠭⠽⠵⠯⠿⠷⠮⠾).[note 1]

The next ten letters, ending in w, are the same again, except that for this series position 6 (purple dot in the table above) is used without a dot at position 3. In French braille these are the letters â ê î ô û ë ï ü ö w (⠡⠣⠩⠹⠱⠫⠻⠳⠪⠺). W had been tacked onto the end of 39 letters of the French alphabet to accommodate English.

The a–j series shifted down by one dot space (⠂⠆⠒⠲⠢⠖⠶⠦⠔⠴) is used for punctuation. Letters a ⠁ and c ⠉, which only use dots in the top row, were shifted two places for the apostrophe and hyphen: ⠄⠤. (These are also the decade diacritics, at left in the table below, of the second and third decade.)

In addition, there are ten patterns that are based on the first two letters (⠁⠃) with their dots shifted to the right; these were assigned to non-French letters (ì ä ò ⠌⠜⠬), or serve non-letter functions: ⠈ (superscript; in English the accent mark), ⠘ (currency prefix), ⠨ (capital, in English the decimal point), ⠼ (number sign), ⠸ (emphasis mark), ⠐ (symbol prefix).

The 64 modern braille cells[note 2]

decade			numeric sequence											shift right
1st
2nd
3rd
4th
5th	shift down

Originally there had been nine decades. The fifth through ninth used dashes as well as dots, but proved to be impractical and were soon abandoned. These could be replaced with what we now know as the number sign (⠼), though that only caught on for the digits (old 5th decade → modern 1st decade). The dash occupying the top row of the original sixth decade was simply dropped, producing the modern fifth decade. (See 1829 braille.)

Silver wedding bands with names Henri(que) and Tita written in braille

Braille was the first writing system with binary encoding.[7] The system as devised by Braille consists of two parts:[8]

1. Character encoding that mapped characters of the French alphabet to tuples of six bits (the dots),
2. The physical representation of those six-bit characters with raised dots in a braille cell.

Within an individual cell, the dot positions are arranged in two columns of three positions. A raised dot can appear in any of the six positions, producing sixty-four (2⁶) possible patterns, including one in which there are no raised dots. For reference purposes, a pattern is commonly described by listing the positions where dots are raised, the positions being universally numbered, from top to bottom, as 1 to 3 on the left and 4 to 6 on the right. 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 above and below. Different assignments of braille codes (or code pages) are used to map the character sets of different printed scripts to the six-bit cells. Braille assignments have also been created for mathematical and musical notation. However, because the six-dot braille cell allows only 64 (2⁶) patterns, including space, the characters of a braille script commonly have multiple values, depending on their context. That is, character mapping between print and braille is not one-to-one. For example, the character ⠙ corresponds in print to both the letter d and the digit 4.

In addition to simple encoding, many braille alphabets use contractions to reduce the size of braille texts and to increase reading speed. (See Contracted braille)

Lucy Sergent, 26-year-old daughter of a Kentucky coal miner, writing with a slate and stylus in 1946. Blind from birth, she attended the Kentucky School for the Blind for 11 years.

Braille typewriter

Braille may be produced by hand using a slate and stylus in which each dot is created from the back of the page, writing in mirror image, or it may be produced on a braille typewriter or Perkins Brailler, or an electronic Brailler or eBrailler. Because braille letters cannot be effectively erased and written over if an error is made, an error is overwritten with all six dots (⠿). Interpoint refers to braille printing that is offset, so that the paper can be embossed on both sides, with the dots on one side appearing between the divots that form the dots on the other. Using a computer or other electronic device, Braille may be produced with a braille embosser (printer) or a refreshable braille display (screen).

Letters

The first 25 braille letters, up through the first half of the 3rd decade, transcribe a–z (skipping w). In English Braille, the rest of that decade is rounded out with the ligatures and, for, of, the, and with. Omitting dot 3 from these forms the 4th decade, the ligatures ch, gh, sh, th, wh, ed, er, ou, ow and the letter w.

ch	sh	th

(See English Braille.)

Formatting

Various formatting marks affect the values of the letters that follow them. They have no direct equivalent in print. The most important in English Braille are:

Capital follows	Number follows

That is, ⠠⠁ is read as capital 'A', and ⠼⠁ as the digit '1'.

Punctuation

Basic punctuation marks in English Braille include:

Comma	Semicolon	Apostrophe	Colon	Hyphen	Decimal point
Full stop (Period)	Exclamation point	Open quote, question mark	Close quote	Bracket (Parentheses)	Slash (Fraction)

⠦ is both the question mark and the opening quotation mark. Its reading depends on whether it occurs before a word or after.

⠶ is used for both opening and closing parentheses. Its placement relative to spaces and other characters determines its interpretation.

Punctuation varies from language to language. For example, French Braille uses ⠢ for its question mark and swaps the quotation marks and parentheses (to ⠶ and ⠦⠴); it uses the period (⠲) for the decimal point, as in print, and the decimal point (⠨) to mark capitalization.

Contractions

For a full list of abbreviations and contractions in English, see English Braille § Contractions.

Braille contractions are words and affixes that are shortened so that they take up fewer cells. In English Braille, for example, the word afternoon is written with just three letters, ⠁⠋⠝ ⟨afn⟩, much like stenoscript. There are also several abbreviation marks that create what are effectively logograms.[8] The most common of these is dot 5, which combines with the first letter of words. With the letter ⠍ m, the resulting word is ⠐⠍ mother. There are also ligatures ("contracted" letters), which are single letters in braille but correspond to more than one letter in print. The letter ⠯ and, for example, is used to write words with the sequence a-n-d in them, such as ⠓⠯ hand.

afternoon (a-f-n)	mother (dot 5–m)	hand (h-and)

Braille writing machine

Stainsby Braille writer

A Braille writing machine is a typewriter with six keys that allow to write in Braille alphabet on a regular white page.

The first Braille typewriter to gain general acceptance was invented by Frank Haven Hall (Superintendent of the Illinois School for the Blind), and was presented to the public in 1892.[10][11]

The Stainsby Brailler, developed by Henry Stainsby in 1903, is a mechanical writer with a sliding carriage that moves over an aluminium plate as it embosses Braille characters. An improved version was introduced around 1933.[12][13]

In 1951 David Abraham, a woodworking teacher at the Perkins School for the Blind produced a more advanced Braille typewriter, the Perkins Brailler.[14]

Braille printers or embosser were produced in 1950s. In 1960 Robert Mann, a teacher in MIT, wrote DOTSYS, a software that allowed automatic braille translation, and another group created an embossing device called "M.I.T. Braillemboss.". The Mitre Corporation team of Robert Gildea, Jonathan Millen, Reid Gerhart and Joseph Sullivan (now president of Duxbury Systems) developed DOTSYS III, the first braille translator written in a portable programming language. DOTSYS III was developed for the Atlanta Public Schools as a public domain program.[15][16][17]

In 1991 Ernest Bate developed the Mountbatten Brailler, an electronic machine used to type braille on braille paper, giving it a number of additional features such as word processing, audio feedback and embossing. This version was improved in 2008 with a quiet writer that had an erase key.

In 2011 David S. Morgan produced the first SMART Brailler machine, with added text to speech function and allowed digital capture of data entered.[18]

Braille is usually read in printed forms such as paper books written in braille, braille public signals and also on Braille e-books. Currently more than 1% of all printed books have been translated into braille.

Although the finger can read only one braille character at a time, the brain chunks braille at a higher level, processing words a digraph, root or suffix at a time. The processing largely takes place in the visual cortex.[4]

Children who are blind not only have the educational disadvantage of not being able to see – they also miss out on fundamental parts of early and advanced education if not provided with the necessary tools. Children who are blind or visually impaired can begin learning pre-braille skills from a very young age to become fluent braille readers as they get older.

Braille on a box of tablets. The raised Braille reads 'plavix'.

Braille book and the same book in inkprint

Although it is possible to transcribe print by simply substituting the equivalent braille character for its printed equivalent, in English such a character-by-character transcription (known as uncontracted braille) is only used by beginners.

Braille characters are much larger than their printed equivalents, and the standard 11" by 11.5" (28 cm × 30 cm) page has room for only 25 lines of 43 characters. To reduce space and increase reading speed, most braille alphabets and orthographies use ligatures, abbreviations, and contractions. Virtually all English Braille books are transcribed in this contracted braille, which adds an additional layer of complexity to English orthography: The Library of Congress's Instruction Manual for Braille Transcribing[28] runs to over 300 pages and braille transcribers must pass certification tests.

Fully contracted braille is known as Grade 2 Braille. There is an intermediate form, called Grade 1 Braille, that is between Computer Braille (one-for-one identity with print) and Grade 2 Braille. In Grade 1 Braille, the capital sign and number sign are used, and most punctuation marks are shown using their Grade 2 values.

The system of contractions in English Braille begins with a set of 23 words which are contracted to single characters. Thus the word but is contracted to the single letter b, can to c, do to d, and so on. Even this simple rule creates issues requiring special cases; for example, d is, specifically, an abbreviation of the verb do; the noun do representing the note of the musical scale is a different word, and must be spelled out.

Portions of words may be contracted, and many rules govern this process. For example, the character with dots 2-3-5 (the letter "f" lowered in the Braille cell) stands for "ff" when used in the middle of a word. At the beginning of a word, this same character stands for the word "to"; the character is written in braille with no space following it. (This contraction was removed in the Unified English Braille Code.) At the end of a word, the same character represents an exclamation point.

Some contractions are more similar than their print equivalents. For example, the contraction ⟨lr⟩, meaning 'letter', differs from ⟨ll⟩, meaning 'little', only by one dot in the second letter: ⠇⠇ little, ⠇⠗ letter. This causes greater confusion between the braille spellings of these words and can hinder the learning process of contracted braille.[29]

The contraction rules take into account the linguistic structure of the word; thus, contractions are generally not to be used when their use would alter the usual braille form of a base word to which a prefix or suffix has been added. Some portions of the transcription rules are not fully codified and rely on the judgment of the transcriber. Thus, when the contraction rules permit the same word in more than one way, preference is given to "the contraction that more nearly approximates correct pronunciation."

Grade 3 Braille[30] is a variety of non-standardized systems that include many additional shorthand-like contractions. They are not used for publication, but by individuals for their personal convenience.

When people produce braille, this is called braille transcription. When computer software produces braille, this is called braille translation. Braille translation software exists to handle most of the common languages of the world, and many technical areas, such as mathematics (mathematical notation), for example WIMATS, music (musical notation), and tactile graphics.

Since Braille is one of the few writing systems where tactile perception is used, as opposed to visual perception, a braille reader must develop new skills. One skill important for Braille readers is the ability to create smooth and even pressures when running one's fingers along the words. There are many different styles and techniques used for the understanding and development of braille, even though a study by B. F. Holland[31] suggests that there is no specific technique that is superior to any other.

Another study by Lowenfield & Abel[32] shows that braille can be read "the fastest and best... by students who read using the index fingers of both hands". Another important reading skill emphasized in this study is to finish reading the end of a line with the right hand and to find the beginning of the next line with the left hand simultaneously. One final conclusion drawn by both Lowenfield and Abel is that children have difficulty using both hands independently where the right hand is the dominant hand. But this hand preference does not correlate to other activities.

Braille plate at Duftrosengarten in Rapperswil, Switzerland

When Braille was first adapted to languages other than French, many schemes were adopted, including mapping the native alphabet to the alphabetical order of French – e.g. in English W, which was not in the French alphabet at the time, is mapped to braille X, X to Y, Y to Z, and Z to the first French-accented letter – or completely rearranging the alphabet such that common letters are represented by the simplest braille patterns. Consequently, mutual intelligibility was greatly hindered by this state of affairs. In 1878, the International Congress on Work for the Blind, held in Paris, proposed an international braille standard, where braille codes for different languages and scripts would be based, not on the order of a particular alphabet, but on phonetic correspondence and transliteration to Latin.[33]

This unified braille has been applied to the languages of India and Africa, Arabic, Vietnamese, Hebrew, Russian, and Armenian, as well as nearly all Latin-script languages. Greek, for example, gamma is written as Latin g, despite the fact that it has the alphabetic position of c; Hebrew bet, the second letter of the alphabet and cognate with the Latin letter b, is sometimes pronounced /b/ and sometimes /v/, and is written b or v accordingly; Russian ts is written as c, which is the usual letter for /ts/ in those Slavic languages that use the Latin alphabet; and Arabic f is written as f, despite being historically p, and occurring in that part of the Arabic alphabet (between historic o and q).

Other systems for assigning values to braille patterns are also followed beside the simple mapping of the alphabetical order onto the original French order. Some braille alphabets start with unified braille, and then diverge significantly based on the phonology of the target languages, while others diverge even further.

In the various Chinese systems, traditional braille values are used for initial consonants and the simple vowels. In both Mandarin and Cantonese Braille, however, characters have different readings depending on whether they are placed in syllable-initial (onset) or syllable-final (rime) position. For instance, the cell for Latin k, ⠅, represents Cantonese k (g in Yale and other modern romanizations) when initial, but aak when final, while Latin j, ⠚, represents Cantonese initial j but final oei.

Novel systems of braille mapping include Korean, which adopts separate syllable-initial and syllable-final forms for its consonants, explicitly grouping braille cells into syllabic groups in the same way as hangul. Japanese, meanwhile, combines independent vowel dot patterns and modifier consonant dot patterns into a single braille cell – an abugida representation of each Japanese mora.

A bottle of Chapoutier wine, with braille on the label

An embossed map of a German train station, with braille text

The current series of Canadian banknotes has a tactile feature consisting of raised dots that indicate the denomination, allowing bills to be easily identified by blind or low vision people. It does not use standard braille; rather, the feature uses a system developed in consultation with blind and low vision Canadians after research indicated that braille was not sufficiently robust and that not all potential users read braille. Mexican bank notes, Australian bank notes, Indian rupee notes, Israeli new shekel notes[34] and Russian ruble notes also have special raised symbols to make them identifiable by persons who are blind or low vision.[35]

In India there are instances where the parliament acts have been published in braille, such as The Right to Information Act.[36]

In the United States, the Americans with Disabilities Act of 1990[37] requires various building signage to be in braille.

In the United Kingdom, it is required that medicines have the name of the medicine in Braille on the labeling.[38]

Australia also recently introduced the tactile feature onto their five-dollar banknote[39]

U.K. September 2017 – On the front of the £10 polymer note (the side with raised print), there are two clusters of raised dots in the top left hand corner. This tactile feature helps blind and partially sighted people identify the value of the note.[40]

Braille was added to the Unicode Standard in September 1999 with the release of version 3.0.

Most braille embossers and refreshable braille displays do not use the Unicode code points, but instead reuse the 8-bit code points that are assigned to standard ASCII for braille ASCII. (Thus, for simple material, the same bitstream may be interpreted equally as visual letter forms for sighted readers or their exact semantic equivalent in tactile patterns for blind readers. However some codes have quite different tactile versus visual interpretations and most are not even defined in Braille ASCII.)

Some embossers have proprietary control codes for 8-dot braille or for full graphics mode, where dots may be placed anywhere on the page without leaving any space between braille cells so that continuous lines can be drawn in diagrams, but these are rarely used and are not standard.

The Unicode standard encodes 6-dot and 8-dot braille glyphs according to their binary appearance, rather than following their assigned numeric order. Dot 1 corresponds to the least significant bit of the low byte of the Unicode scalar value, and dot 8 to the high bit of that byte.

The Unicode block for braille is U+2800 ... U+28FF. The mapping of patterns to characters etc is language dependent: even for English for example, see American Braille and English Braille.

Every year on 4 January, World Braille Day is observed internationally to commemorate the birth of Louis Braille and to recognize his efforts, but the event is not considered a public holiday.[41]

Wikimedia Commons has media related to Braille.

• Association Valentin Haüy
• Alternate Text Production Center
• Braille Part 1 Text To Speech For The Visually Impaired