Unicode Subscripts And Superscripts

Unicode has subscripted and superscripted versions of a number of characters including a full set of Arabic numerals. These characters allow any polynomial, chemical and certain other equations to be represented in plain text without using any form of markup like HTML or TeX.

The World Wide Web Consortium and the Unicode Consortium have made recommendations on the choice between using markup and using superscript and subscript characters:

When used in mathematical context (MathML) it is recommended to consistently use style markup for superscripts and subscripts.... However, when super and sub-scripts are to reflect semantic distinctions, it is easier to work with these meanings encoded in text rather than markup, for example, in phonetic or phonemic transcription.

Uses

The ''intended'' use when these characters were added to Unicode was to allow chemical and algebra formulas and phonetics to be written without markup, but produce true superscripts and subscripts. Thus "H₂O" (using a subscript character) is ''supposed'' to be identical to "H₂O" (with subscript markup).

In reality most fonts that include these characters ignore the Unicode definition, and design the digits for mathematical numerator and denominator glyphs, which are smaller than normal characters but are aligned with the cap line and the baseline, respectively. When used with the solidus, these glyphs are useful for making arbitrary diagonal fractions (similar to the ½ glyph). Making fractions using existing software super/subscripts requires many characters and does not look like the rendered fraction (example: ¹/₂), so font designers provided this alternative. This also makes the superscript letters useful for ordinal indicators, more closely matching the ª and º characters. However it makes them incorrect for normal super and subscripts, and formulas are rendered correctly by using markup rather than these characters.

Unicode intended to produce diagonal fractions through a different mechanism but it is very poorly supported. The fraction slash U+2044 is visually similar to the solidus, but when used with the ordinary digits (not the superscripts and subscripts) is intended to tell a layout system that a fraction such as ¾ should be rendered using automatic glyph substitutionFor a general overview and technical information on glyph substitution (though not specifically for fractions)
GSUB — Glyph Substitution Table
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Superscripts and subscripts block

The most common superscript digits (1, 2, and 3) were in ISO-8859-1 and were therefore carried over into those positions in the Latin-1 range of Unicode. The rest were placed in a dedicated section of Unicode at to U+209F. The two tables below show these characters. Each superscript or subscript character is preceded by a normal ''x'' to show the subscripting/superscripting. The table on the left contains the actual Unicode characters; the one on the right contains the equivalents using HTML markup for the subscript or superscript.

Other superscript and subscript characters

Unicode version 15.0 also includes subscript and superscript characters that are intended for semantic usage, in the following blocks:
;Superscript
* The Latin-1 Supplement block contains the feminine and masculine ordinal indicators ª and º.
* The Latin Extended-C block contains one additional superscript, ⱽ.
* The Latin Extended-D block contains six superscripts: ꝰ ꟲ ꟳ ꟴ ꟸ ꟹ.
* The Latin Extended-E block contains five superscripts: ꭜ ꭝ ꭞ ꭟ ꭩ.
* The Latin Extended-F block is entirely superscript IPA letters: 𐞁 𐞂 𐞃 𐞄 𐞅 𐞇 𐞈 𐞉 𐞊 𐞋 𐞌 𐞍 𐞎 𐞏 𐞐 𐞑 𐞒 𐞓 𐞔 𐞕 𐞖 𐞗 𐞘 𐞙 𐞚 𐞛 𐞜 𐞝 𐞞 𐞟 𐞠 𐞡 𐞢 𐞣 𐞤 𐞥 𐞦 𐞧 𐞨 𐞩 𐞪 𐞫 𐞬 𐞭 𐞮 𐞯 𐞰 𐞲 𐞳 𐞴 𐞵 𐞶 𐞷 𐞸 𐞹 𐞺.
* The Spacing Modifier Letters block has superscripted letters and symbols used for phonetic transcription: ʰ ʱ ʲ ʳ ʴ ʵ ʶ ʷ ʸ ˀ ˁ ˠ ˡ ˢ ˣ ˤ.
* The Phonetic Extensions block has several superscripted letters and symbols: Latin/IPA ᴬ ᴭ ᴮ ᴯ ᴰ ᴱ ᴲ ᴳ ᴴ ᴵ ᴶ ᴷ ᴸ ᴹ ᴺ ᴻ ᴼ ᴽ ᴾ ᴿ ᵀ ᵁ ᵂ ᵃ ᵄ ᵅ ᵆ ᵇ ᵈ ᵉ ᵊ ᵋ ᵌ ᵍ ᵏ ᵐ ᵑ ᵒ ᵓ ᵖ ᵗ ᵘ ᵚ ᵛ, Greek ᵝ ᵞ ᵟ ᵠ, Cyrillic ᵸ, other ᵎ ᵔ ᵕ ᵙ ᵜ. These are intended to indicate secondary articulation.
* The Phonetic Extensions Supplement block has several more: Latin/IPA ᶛ ᶜ ᶝ ᶞ ᶟ ᶠ ᶡ ᶢ ᶣ ᶤ ᶥ ᶦ ᶧ ᶨ ᶩ ᶪ ᶫ ᶬ ᶭ ᶮ ᶯ ᶰ ᶱ ᶲ ᶳ ᶴ ᶵ ᶶ ᶷ ᶸ ᶹ ᶺ ᶻ ᶼ ᶽ ᶾ, Greek ᶿ.
* The IPA Extensions block has several Latin superscripts: 𐞄 𐞒 𐞖 𐞪 𐞲.
* The Cyrillic Extended-B block contains two Cyrillic superscripts: ꚜ ꚝ.
* The Cyrillic Extended-D block contains many Cyrillic superscripts: 𞀰 𞀱 𞀲 𞀳 𞀷 𞀵 𞀶 𞀷 𞀸 𞀹 𞀺 𞀻 𞀼 𞀽 𞀾 𞀿 𞁀 𞁁 𞁂 𞁃 𞁄 𞁅 𞁆 𞁇 𞁈 𞁉 𞁊 𞁋 𞁌 𞁍 𞁎 𞁏 𞁐 𞁫 𞁬 𞁭.
* The Georgian block contains one superscripted Mkhedruli letter: ჼ.
* The Kanbun block has superscripted annotation characters used in Japanese copies of Classical Chinese texts: ㆒ ㆓ ㆔ ㆕ ㆖ ㆗ ㆘ ㆙ ㆚ ㆛ ㆜ ㆝ ㆞ ㆟.
* The Tifinagh block has one superscript letter : ⵯ.
* The Unified Canadian Aboriginal Syllabics and its Extended blocks contain several mostly consonant-only letters to indicate syllable coda called Finals, along with some characters that indicate syllable medial known as Medials: Main block ᐜ ᐝ ᐞ ᐟ ᐠ ᐡ ᐢ ᐣ ᐤ ᐥ ᐦ ᐧ ᐨ ᐩ ᐪ ᑉ ᑊ ᑋ ᒃ ᒄ ᒡ ᒢ ᒻ ᒼ ᒽ ᒾ ᓐ ᓑ ᓒ ᓪ ᓫ ᔅ ᔆ ᔇ ᔈ ᔉ ᔊ ᔋ ᔥ ᔾ ᔿ ᕀ ᕁ ᕐ ᕑ ᕝ ᕪ ᕻ ᕯ ᕽ ᖅ ᖕ ᖖ ᖟ ᖦ ᖮ ᗮ ᘁ ᙆ ᙇ ᙚ ᙾ ᙿ; Extended block: ᣔ ᣕ ᣖ ᣗ ᣘ ᣙ ᣚ ᣛ ᣜ ᣝ ᣞ ᣟ ᣳ ᣴ ᣵ.

;Combining superscript
* The Combining Diacritical Marks block contains medieval superscript letter diacritics. These letters are written directly above other letters appearing in medieval Germanic manuscripts, and so these glyphs do not include spacing, for example uͤ. They are shown here over the dotted circle placeholder ◌: ◌ͣ ◌ͤ ◌ͥ ◌ͦ ◌ͧ ◌ͨ ◌ͩ ◌ͪ ◌ͫ ◌ͬ ◌ͭ ◌ͮ ◌ͯ.
* The Combining Diacritical Marks Extended block contains two combining letters for linguistic transcriptions of Scots (◌ᪿ ◌ᫀ) and three combining insular letters for the Middle English Ormulum (◌ᫌ ◌ᫍ ◌ᫎ).
* The Combining Diacritical Marks Supplement block contains additional medieval superscript letter diacritics, enough to complete the basic lowercase Latin alphabet except for j, q and y, a few small capitals and ligatures (ae, ao, av), and additional letters: ◌᷒ ◌ᷓ ◌ᷔ ◌ᷕ ◌ᷖ ◌ᷗ ◌ᷘ ◌ᷙ ◌ᷚ ◌ᷛ ◌ᷜ ◌ᷝ ◌ᷞ ◌ᷟ ◌ᷠ ◌ᷡ ◌ᷢ ◌ᷣ ◌ᷤ ◌ᷥ ◌ᷦ ◌ᷧ ◌ᷨ ◌ᷪ ◌ᷫ ◌ᷬ ◌ᷭ ◌ᷮ ◌ᷯ ◌ᷰ ◌ᷱ ◌ᷲ ◌ᷳ ◌ᷴ, Greek ◌ᷩ.
* The Cyrillic Extended-A and -B blocks contains multiple medieval superscript letter diacritics, enough to complete the basic lowercase Cyrillic alphabet used in Church Slavonic texts, also includes an additional ligature (ст): ◌ⷠ ◌ⷡ ◌ⷢ ◌ⷣ ◌ⷤ ◌ⷥ ◌ⷦ ◌ⷧ ◌ⷨ ◌ⷩ ◌ⷪ ◌ⷫ ◌ⷬ ◌ⷭ ◌ⷮ ◌ⷯ ◌ⷰ ◌ⷱ ◌ⷲ ◌ⷳ ◌ⷴ ◌ⷵ ◌ⷶ ◌ⷷ ◌ⷸ ◌ⷹ ◌ⷺ ◌ⷻ ◌ⷼ ◌ⷽ ◌ⷾ ◌ⷿ ◌ꙴ ◌ꙵ ◌ꙶ ◌ꙷ ◌ꙸ ◌ꙹ ◌ꙺ ◌ꙻ ◌ꚞ ◌ꚟ.

;Subscript
* The Latin Extended-C block contains one additional subscript, ⱼ.
* The Phonetic Extensions block has several subscripted letters and symbols: Latin/IPA ᵢ ᵣ ᵤ ᵥ and Greek ᵦ ᵧ ᵨ ᵩ ᵪ.
* The Cyrillic Extended-D block also contains many Cyrillic subscripts: 𞁑 𞁒 𞁓 𞁔 𞁕 𞁖 𞁗 𞁘 𞁙 𞁚 𞁛 𞁜 𞁝 𞁞 𞁟 𞁠 𞁡 𞁢 𞁣 𞁤 𞁥 𞁦 𞁧 𞁨 𞁩 𞁪.

;Combining subscript
* The Combining Diacritical Marks Supplement block contains a combining subscript: ◌᷊.

Latin, Greek and Cyrillic tables

Consolidated, the Unicode standard contains superscript and subscript versions of a subset of Latin, Greek and Cyrillic letters. Here they are arranged in alphabetical order for comparison (or for copy and paste convenience). Since these characters appear in different Unicode ranges, they may not appear to be the same size or position due to font substitution in the browser. Shaded cells mark small capitals that are not very distinct from minuscules, and Greek letters that are indistinguishable from Latin, and so would not be expected to be supported by Unicode.

Many of these characters were added to Unicode 15, in the Cyrillic Extended-D block, and published in 2022.

See also small caps in Unicode.

Composite characters

Primarily for compatibility with earlier character sets, Unicode contains a number of characters that compose super- and subscripts with other symbols. In most fonts these render much better than attempts to construct these symbols from the above characters or by using markup.
* The Latin-1 Supplement block contains the precomposed fractions ½, ¼, and ¾. The copyright © and registered trademark signs ® are also in this block.
* The General Punctuation block contains the permille sign ‰ and the per-ten-thousand sign ‱, and Basic Latin has the percent sign %.
* The Number Forms block contains several precomposed fractions: ⅐ ⅑ ⅒ ⅓ ⅔ ⅕ ⅖ ⅗ ⅘ ⅙ ⅚ ⅛ ⅜ ⅝ ⅞ ⅟ ↉.
* The Letterlike Symbols block contains a few symbols composed of subscript and superscript characters: ℀ ℁ ℅ ℆ № ℠ ™ ⅍.
* The Enclosed Alphanumeric Supplement block contains three superscript abbreviations 🅪 🅫 🅬: MC for (trademark), MD for (registered trademark), both used in Canada; MR for (registered trademark) in Spanish and Portuguese speaking countries.
* The Miscellaneous Technical block has one additional subscript, a subscript 10 (⏨), for the purpose of scientific notation.
* The Unified Canadian Aboriginal Syllabics and its Extended blocks contain several letters composed with superscripted letters to indicate extended sound values: Main block ᐂ ᐫ ᐬ ᐭ ᐮ ᐰ ᑍ ᑧ ᑨ ᑩ ᑪ ᑬ ᒅ ᒆ ᒇ ᒈ ᒊ ᒤ ᓁ ᓔ ᓮ ᔌ ᔍ ᔎ ᔏ ᔧ ᕅ ᕔ ᕿ ᖀ ᖁ ᖂ ᖃ ᖄ ᖎ ᖏ ᖐ ᖑ ᖒ ᖓ ᖔ ᙯ ᙰ ᙱ ᙲ ᙳ ᙴ ᙵ ᙶ, Extended block ᢰ ᢱ ᢲ ᢳ ᢴ ᢵ ᢶ ᢷ ᢸ ᢹ ᢺ ᢻ ᢼ ᢽ ᢾ ᢿ ᣀ ᣁ ᣂ ᣃ ᣄ ᣅ.

Notes

References

{{DEFAULTSORT:Subscripts and superscripts, Unicode
Unicode