Braille Code of
Chemical Notation
1997


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Rules
  • 1. Braille Indicators
  • 2. General Format
  • 3. Signs and Symbols
  • 4. Formulas/Equations
  • 5. Labels
  • 6. Type Forms
  • 7. Super/Subscripts
  • 8. Names
  • 9. Abbreviations
  • Index of Symbols
  • Index
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  • ©hoose LANGUAGE

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    3 CHEMICAL SIGNS AND SYMBOLS


      3.1    Chemical Arrows. The braille representation of arrows listed below must be used in place of the ones listed in the Nemeth Code. All other arrows must be transcribed as required by the Nemeth Code.
    Up-pointing
    Regular
    $<
    Boldface $_<
    Down-pointing
    Regular
    $%
    Boldface $_%
    Bold up-pointing followed
    by regular down-pointing
    $_<"%
    Regular up-pointing followed
    by bold down-pointing
    $<"_%
    Regular up-pointing followed
    by regular down-pointing
    $<"%
    Vertical or oblique dipole
    Up-pointing
    $+<
    Down-pointing $+%
    Half-barb up-pointing followed
    by half barb down-pointing
    $@<",%
    Horizontal
    Dipole, right-pointing
    $+3o
    Dipole, left-pointing $[3#
    Crossed arrow /$[3o
    3.2 Bonds
    Single regular . *
    Single bold or hollow /
    Small x x x
    Pair, regular :  ¨ ?
    Pair, hollow or bold #
    Pair, x's [
    Pair, right or upper bold or hollow,
    left or lower regular
    ]
    Pair, right or upper x, left or
    lower regular
    %
    Pair, right or upper regular, left or
    lower bold or hollow
    &
    Pair, right or upper regular,
    left or lower x
    $
    Pair, right or upper bold or hollow,
    left or lower x
    :
    Pair, right or upper x, left or
    lower bold or hollow
    >
    Triplet (three pairs of regular
    electron dots)
    =  or  \
    Other triplets
      Insert dots 46 before a pair shown horizontally
      in the list above to indicate that the arrangement
      is a triplet. For example:
    .%
      3.2.2  Horizontal (including indicators)

    Single _3]
    Double _7]
    Triple _=]
    Arrow, right-pointing _3o]
    Arrow, left-pointing _[3]
    Barred _\]
    Bold _g]
    Broken _2]
    Dotted _1]
    Jagged, single _e]
    Jagged, double _ei]
    Wavy, single _9]
    Wavy, double _95]




      3.2.3 Oblique
      Lower left to upper right _/
      Lower left to upper right, double _//
      Upper left to lower right _*
      Upper left to lower right, double _**
      Arrow, lower left to upper right _/<
      Arrow, lower right to upper left _*<
      Arrow,, upper left to lower right _*%
      Arrow, upper right to lower left _/%
      Broken, lower left to upper right _2/
      Broken, upper left to lower right _2*
      Dotted, lower left to upper right _1/
      Dotted, upper left to lower right _1*
      Barred, lower left to upper right _x/
      Barred, upper left to lower right _x*
      Bonds, cont.

      3.2.4 Vertical

      Single | _
      Double || __
      Triple ||| ___
      Arrow, up-pointing _<
      Arrow, down-pointing _%
      Barred _x
      Bold _g
      Broken _2
      Dotted _1
      Jagged, single _e
      Jagged, double _ei
      Wavy, single _9
      Wavy, double _95


      3.2.5 Wedges, Vertical or Oblique

      Down-pointing, normal outline _m
      Up-pointing, normal outline _u
      Down-pointing, filled in _p
      Up-pointing, filled in _v
      Down-pointing, dotted outline _1m
      Up-pointing, dotted outline _1u
      Down-pointing, dashed outline _2m
      Up-pointing, dashed outline _2u
      Down-pointing, barred _xm
      Up-pointing, barred _xu


      3.2.6 Wedges, Horizontal (including indicators)

      Right-pointing, normal outline _o]
      Left-pointing, normal outline _[]
      Right-pointing, filled in _r]
      Left-pointing, filled in _w]
      Right-pointing, dotted outline _1o]
      Left-pointing, dotted outline _1[]
      Right-pointing, dashed outline _2o]
      Left-pointing, dashed outline _2[]
      Right-pointing, barred _|o]
      Left-pointing, barred _|[]


      3.3 Ring Structures

      Vertices (this two-celled symbol represents
      any unlabeled vertex)

                       [o



      Circle (broken outline)
                                                                                        $bc


      Hexagon (broken outline)
                                                                                        $b6



      3.4 Miscellaneous Symbols and Indicators

        3.4.1 Chemical Period

        3.4.2 Modifiers. These symbols are to be used as spatial modifiers only. In linear expressions, the full construct of the Nemeth Code must be used. (See Examples 5.3.1-9 and 7.2-3.)



        Crossed O @.o
        Plus sign within a circle $c+
        Minus sign within a circle $c-

        3.4.3 Lines (partitions, not bonds)

        Broken vertical .|
        Dotted vertical @|

        Dotted, double vertical @|@|
        Jagged, vertical @@|
        Jagged, horizontal "5959


        3.4.4 Modified-Letter Indicators

        Small capital* @",

        Barred capital @;|,

        Example 3.4.4-1: (small capital D) D

        @",d

        Example 3.4.4-2: (barred capital R)

        @;|,r

        *Assuming the small capital letter is on the same level as normal letters.

      3.5   Symbols for the Chemical Elements. The Nemeth Code defines "sign" as the printed mark and "symbol" as the braille representation of that sign. The usual nomenclature for the letter(s) representing the name of a chemical element is "chemical symbol." In this Chemistry Code, the word "SYMBOL" (all upper case) is used to denote the letter(s) representing a chemical element and "symbol" (lower case) to denote the meaning as given in the Nemeth Code. A SYMBOL for a chemical element consists of a single capitalized letter or a capitalized letter followed by one or more lower case letters. These SYMBOLS are not abbreviations as defined by the Nemeth Code, (i.e., Nemeth Code Rule VIII does not apply to SYMBOLS).

      ** CAUTION ** In print, sanserif type form is often employed in tables and diagrams. In this case, the capital I (eye) and the lower case l (ell) are easily confused. Upon careful examination it is usually possible to distinguish between them as the I is usually thicker than the l. Be aware of this and be sure to discriminate.


      3.5.1 Capitalization. When SYMBOLS appear in a series, as in a molecule, each SYMBOL must be capitalized individually.


      3.5.2 Spacing. Follow the print spacing.

      Example 3.5.2-1: CH

      ,c,h

      Example 3.5.2-2: MgO

      ,mg,o

      Example 3.5.2-3: H--O--H

      ,h_3],o_3],h


      3.5.3 Punctuation. Chemical SYMBOLS must be punctuated in the mathematical mode as defined in Nemeth Code Rule VI.

      Example 3.5.3-1: Water is HOH.

      ,wat] is ,h,o,h_4



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