This is documentation for Mathematica 3, which was
based on an earlier version of the Wolfram Language.
 NumberSigns NumberSigns is an option for NumberForm and related functions which gives strings to use as signs for negative and positive numbers. NumberSigns -> " sneg ", " spos " specifies that " sneg " should be given as the sign for negative numbers, and " spos " for positive numbers. The default setting is NumberSigns -> {"-", ""}. NumberSigns -> " snleft ", " snright " , " spleft ", " spright " specifies strings to put both on the left and right of numbers to specify their signs. In AccountingForm, the default setting is NumberSigns -> {{"(", ")"}, ""}. See the Mathematica book: Section 2.8.7. See also: SignPadding. Further Examples This breaks digits into blocks of length 3. In[1]:= Out[1]//NumberForm= You can specify any string to use as a separator between blocks of digits. In[2]:= Out[2]//NumberForm= This gives an explicit plus sign for positive numbers, and uses | in place of a decimal point. In[3]:= Out[3]//NumberForm=