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The intended use [2] when these characters were added to Unicode was to produce true superscripts and subscripts so that chemical and algebraic formulas could be written without markup. Thus "H₂O" (using a subscript 2 character) is supposed to be identical to "H 2 O" (with subscript markup).
Superscripts and Subscripts is a Unicode block containing superscript and subscript numerals, mathematical operators, and letters used in mathematics and phonetics. The use of subscripts and superscripts in Unicode allows any polynomial, chemical and certain other equations to be represented in plain text without using any form of markup like HTML or TeX.
Example of subscript and superscript. In each example the first "2" is professionally designed, and is included as part of the glyph set; the second "2" is a manual approximation using a small version of the standard "2".
SUBSCRIPT PLUS SIGN ... 2. ^ Unicode code points U+2329 and U+232A are deprecated as of Unicode version 5.2: Geometric Shapes block The Geometric Shapes block (U+25A0 ...
Superscripts and Subscripts Official ... 2. ^ Grey areas indicate non-assigned code points 3. ^ Refer to the Latin-1 Supplement Unicode block for characters ¹ ...
As of Unicode version 16.0, there are 155,063 characters with code points, covering 168 modern and historical scripts, as well as multiple symbol sets.This article includes the 1,062 characters in the Multilingual European Character Set 2 subset, and some additional related characters.
In HTML and XML, a numeric character reference refers to a character by its Universal Character Set/Unicode code point, and uses the format: &#xhhhh;. or &#nnnn; where the x must be lowercase in XML documents, hhhh is the code point in hexadecimal form, and nnnn is the code point in decimal form.
5.2.1 Subscripts, superscripts, integrals. 5.3 Fractions, matrices, multilines. ... In the table below, the codes on the left produce the symbols on the right, but ...