由于工作的需求，需要在word中插入带入带有上标和下标的字符串，比如这样的一个字符串：SO₄²⁻(mg/L)。在网上搜了好久，终是摸索出点思路。

　　解决办法：使用转义字符加Unicode的HexEntity就可以实现了。比如定义一个SO₄²⁻(mg/L)这样的字符串如下："SO\x2084\x00B2\x207B(mg/L)"。其中x2084为 ₄（注意：此处为4的下标） 的Unicode HexEntity，x00B2为 ²（注意：此处为2的上标） 的Unicode HexEntity，x207B为 ⁻（注意：此处为-的上标） 的Unicode HexEntity。

　　

　　一些常用字符如下：

Common Arithmetic & Alebgra

Character Name

 Character Entity Num 
Entity		 Hex 
Entity
LESS THAN < &lt; < <
GREATER THAN > &gt; > >
LESS THAN OR EQUAL TO ≤ &le; ≤ ≤
GREATER THAN OR EQUAL TO ≥ &ge; ≥ ≥
PLUS OR MINUS ± &plusmn; ± ±
NOT EQUALS ≠ &ne; ≠ ≠
DIVISION SIGN ÷ &divide; ÷ ÷
TIMES X × &times; × ×
MINUS − &minus; − −
DIVISION SLASH ∕ -- ∕ ∕
FRACTION SLASH ⁄ &frasl ⁄ ⁄
SQUARE ROOT RADICAL √ &radic; √ √
CUBE ROOT ∛ -- ∛ &#x221B
FOURTH ROOT ∜ -- ∜ &#x221C
INFINITY ∞ &infin; ∞ ∞
ALEF INFINITY SYMBOL ℵ &alefsym; ℵ ℵ
FUNCTION ITALIC F ƒ &fnof; ƒ ƒ
PRIME (single quote) ′ &prime; ′ ′
DOUBLE PRIME (double quote) ″ &Prime; ″ ″
TRIPLE PRIME (triple quote) ‴ -- ‴ ‴
THEREFORE (Triangular Dots) ∴ &there4; ∴ ∴
DOT OPERATOR ⋅ &sdot; ⋅ &#x22C5
SUPERSCRIPT TWO ¹ &sup1; ¹ ¹
SUPERSCRIPT TWO ² &sup2; ² ²
SUPERSCRIPT THREE ³ &sup3; ³ ³
LEFT ANGLE BRACKET 〈 &lang; 〈 〈
RIGHT ANGLE BRACKET 〉 &rang; 〉 〉
LEFT CEILING BRACKET ⌈ &lceil; ⌈ ⌈
RIGHT CEILING BRACKET ⌉ &rceil; ⌉ ⌉
LEFT FLOOR BRACKET ⌊ &lceil; ⌊ ⌊
RIGHT FLOOR BRACKET ⌋ &rceil; ⌋ ⌋
CIRCLED PLUS (Direct Sum) ⊕ &oplus; ⊕ &#x2295
CIRCLED TIMES (Vector Product) ⊗ &otimes; ⊗ &#x2297

Superscript Chart（上标）

Character Name Character Num 
Entity		 Hex 
Entity
SUPERSCRIPT ZERO ⁰ ⁰ &#x2070
SUPERSCRIPT ONE 
Entity Code = &sup1;		 ¹ ¹ &#x00B9
SUPERSCRIPT TWO 
Entity Code = &sup2;		 ² ² &#x00B2
SUPERSCRIPT THREE 
Entity Code = &sup3;		 ³ ³ &#x00B3
SUPERSCRIPT FOUR ⁴ ⁴ &#x2074
SUPERSCRIPT FIVE ⁵ ⁵ &#x2075
SUPERSCRIPT SIX ⁶ ⁶ &#x2076
SUPERSCRIPT SEVEN ⁷ ⁷ &#x2077
SUPERSCRIPT EIGHT ⁸ ⁸ &#x2078
SUPERSCRIPT NINE ⁹ ⁹ &#x2079
SUPERSCRIPT PLUS SIGN ⁺ ⁺ &#x207A
SUPERSCRIPT MINUS ⁻ ⁻ &#x207B
SUPERSCRIPT EQUALS SIGN ⁼ ⁼ &#x207C
SUPERSCRIPT LEFT PARENTHESIS ⁽ ⁽ &#x207D
SUPERSCRIPT RIGHT PARENTHESIS ⁾ ⁾ &#x207E
SUPERSCRIPT LATIN SMALL LETTER I ⁱ ⁱ &#x2071
SUPERSCRIPT LATIN SMALL LETTER N ⁿ ⁿ &#x207F

Subscript Codes（下标）

Character Name Character Num 
Entity		 Hex 
Entity
SUBSCRIPT ZERO ₀ ₀ &#x2080
SUBSCRIPT ONE ₁ ₁ &#x2081
SUBSCRIPT TWO ₂ ₂ &#x2082
SUBSCRIPT THREE ₃ ₃ &#x2083
SUBSCRIPT FOUR ₄ ₄ &#x2084
SUBSCRIPT FIVE ₅ ₅ &#x2085
SUBSCRIPT SIX ₆ ₆ &#x2086
SUBSCRIPT SEVEN ₇ ₇ &#x2087
SUBSCRIPT EIGHT ₈ ₈ &#x2088
SUBSCRIPT NINE ₉ ₉ &#x2089
SUBSCRIPT PLUS SIGN ₊ ₊ &#x208A
SUBSCRIPT MINUS ₋ ₋ &#x208B
SUBSCRIPT EQUALS SIGN ₌ ₌ &#x208C
SUBSCRIPT LEFT PARENTHESIS ₍ ₍ &#x208D
SUBSCRIPT RIGHT PARENTHESIS ₎ ₎ &#x208E
LATIN SUBSCRIPT SMALL LETTER A ₐ ₐ &#x2090
LATIN SUBSCRIPT SMALL LETTER E ₑ ₑ &#x2091
LATIN SUBSCRIPT SMALL LETTER O ₒ ₒ &#x2092
LATIN SUBSCRIPT SMALL LETTER I ᵢ ᵢ &#x1D62
LATIN SUBSCRIPT SMALL LETTER R ᵣ ᵣ &#x1D63
LATIN SUBSCRIPT SMALL LETTER U ᵤ ᵤ &#x1D64
LATIN SUBSCRIPT SMALL LETTER V ᵥ ᵥ &#x1D65
LATIN SUBSCRIPT SMALL LETTER X ₓ ₓ &#x2093
GREEK SUBSCRIPT SMALL LETTER BETA ᵦ ᵦ &#x1D66
GREEK SUBSCRIPT SMALL LETTER GAMMA ᵧ ᵧ &#x1D67
GREEK SUBSCRIPT SMALL LETTER RHO ᵨ ᵨ &#x1D68
GREEK SUBSCRIPT SMALL LETTER PHI ᵩ ᵩ &#x1D69
GREEK SUBSCRIPT SMALL LETTER CHI ᵪ ᵪ &#x1D6A

Superscript and Subscript

Check these references for other methods to implement superscript/subscript and extra fractions

Fractions

These codes display fractions set to be all within one line with smaller number, but they can be replaced by other ways of typing a fraction (e.g. "1/2"). 
-- means no HTML entity code exists and that a numeric code must be used.

Character Name Character Entity Num 
Entity		 Hex 
Entity
VULGAR FRACTION 1/4 ¼ &frac14; ¼ ¼
VULGAR FRACTION 1/2 ½ &frac12; ½ ½
VULGAR FRACTION 3/4 ¾ &frac34; ¾ ¾
VULGAR FRACTION 1/3 ⅓ -- ⅓ ⅓
VULGAR FRACTION 2/3 ⅔ -- ⅔ ⅔
VULGAR FRACTION 1/5 ⅕ -- ⅕ ⅕
VULGAR FRACTION 2/5 ⅖ -- ₢ ⅖
VULGAR FRACTION 3/5 ⅗ -- ⅗ ⅗
VULGAR FRACTION 4/5 ⅘ -- ⅘ ⅘
VULGAR FRACTION 1/6 ⅙ -- ⅙ ⅙
VULGAR FRACTION 5/6 ⅚ -- ⅚ ⅚
VULGAR FRACTION 1/8 ⅛ -- ⅛ ⅛
VULGAR FRACTION 3/8 ⅜ -- ⅜ ⅜
VULGAR FRACTION 5/8 ⅝ -- ⅝ ⅝
VULGAR FRACTION 7/8 ⅞ -- ₖ ⅞

Common Statistics

-- means no HTML entity code exists and that a numeric code must be used.

Character Name Character Entity Num 
Entity		 Hex 
Entity
LOWER CASE MU (Mean) μ &mu; μ μ
LOWER CASE SIGMA (Standard Deviation) σ &sigma; σ σ
LOWER CASE CHI χ &chi; χ χ
CAPITAL PI N-ARY PRODUCT ∏ &prod; ∑ ∑
N-ARY COPRODUCT (upside down capital pi) ∐ -- ∐ &#x2210

X-Bar, P-Hat and D-Bar

Some codes like that for x̄ (X-bar) are actually a combination of two codes - the base letter x plus a code for the line above (&#772: or  ̄). Capital letter may need to be reduced in size to accomodate the placement of the combining diacritic.

Note on Safari: These symbols use combining characters and may not be correctly Safari 2 or other older browsers.

Statistical Symbol Codes
Character Name Character HTML Code
X-Bar (Average) x̄ x̄
P-Hat p̂ p̂
D-Bar D̄ <span style="font-size:80%">D</span>̄

Measurement Symbols

Common Symbols

Character Name Character Entity Num 
Entity		 Hex 
Entity
DEGREE SYMBOL ° &deg; ° °
MICRO MU SYMBOL µ &micro; µ µ
SINGLE PRIME (feet, degree minutes) ′ &prime; ′ ߰
DOUBLE PRIME (feet, degree minutes) ″ &Prime; ′ ߰
PER MILLE (1/1000th) ‰ &permil; ‰ ߮

Calculus

Common Calculus Entity Codes

Character Name Character Entity Num 
Entity		 Hex 
Entity
INTEGRAL ∫ &int; ∫ ∫
PARTIAL DIFFERENTIAL ∂ &part; ∂ ࢚
INCREMENT (Difference or capital Delta) Δ &Delta; ∆ &#x2206
NABLA (Backward Difference, Grad or upside down triangle) ∇ &nabla; ∇ &#x2207

Additional Integral Symbols

These symbols have numeric entity codes only.

Character Name Character Num 
Entity		 Hex 
Entity
DOUBLE INTEGRAL ∬ ∬ &#x222C
TRIPLE INTEGRAL ∭ ∭ &#x222D
QUADRUPLE INTEGRAL ⨌ ⨌ &#x2A0C
CONTOUR INTEGRAL ∮ ∮ &#x222E
SURFACE INTEGRAL ∯ ∯ &#x222F
VOLUME INTEGRAL ∰ ∰ &#x2230
CLOCKWISE INTEGRAL ∱ ∱ &#x2231
ANTICCLOCKWISE INTEGRAL ⨑ ⨑ &#x2A11
CLOCKWISE CONTOUR INTEGRAL ∲ ∲ &#x2232
ANTICLOCKWISE CONTOUR INTEGRAL ∳ ∳ &#x2233

Letter Symbols

Character Name Character Entity Num 
Entity		 Hex 
Entity
INFINITY (Sideways 8) ∞ &infin; ∞ ∞
ALEF INFINITY SYMBOL ℵ &alefsym; ℵ ℵ
WEIERSTRASS POWER SET (Script Capital P) ℘ &weierp; ℘ ℘
IMAGINARY NUMBER (Blackletter I) ℑ &image; ′ ′
REAL NUMBER (Blackletter I) ℜ &real; ′ ′
DOUBLE-STRUCK REAL NUMBER (Double R) ℝ -- ℝ ℝ
COMPLEX NUMBERS (Double C) ℂ -- ℂ ℂ
NATURAL NUMBERS (Double N) ℕ -- ℕ ℕ
PRIME NUMBERS (Double P) ℙ -- ℙ ℙ
RATIONAL NUMBERS (Double Q) ℚ -- ℚ ℚ
INTEGERS (Double Z) ℤ -- ℤ ℤ
Character Name Character Entity Num 
Entity		 Hex 
Entity
FOR ALL (Upside-down A) ∀ &forall; ∀ &#x2200
COMPLEMENT (Thin C) ∁ -- ∁ &#x2201
THERE EXISTS (Backwards E) ∃ &exist; ∃ &#x2203
THERE DOES NOT EXIST (Backwards E with slash) ∄ -- ∄ &#x2204
EMPTY SET (O slash) ∅ &empty; ∅ &#x2205
NOT SYMBOL (Corner) ¬ &not; ¬ ¬
TILDE (Alternate Not Symbol) ˜ &tilde; -- --
LOGICAL AND (Wedge or Upside down V Symbol) ∧ &and; ∧ &#x2227
LOGICAL OR (V Symbol) ∨ &or; ∨ &#x2228
XOR ⊻ -- ⊻ &#x22BB
NAND ⊼ -- ⊼ &#x22BC
NOR ⊽ -- ⊽ &#x22BD
INTERSECTION (Cap or Upside Down U) ∩ &cap; ∩ &#x2229
UNION (Cup or U Symbol) ∪ &cup; ∪ &#x222A
ELEMENT OF ∈ &isin; ∈ &#x2208
NOT AN ELEMENT OF ∉ &notin; ∉ &#x2209
SMALL ELEMENT OF ∊ -- ∊ &#x220A
CONTAINS AS MEMBER ∋ &ni; ∋ &#x220B
DOES NOT CONTAIN AS MEMBER ∌ -- ∌ &#x220C
SMALL CONTAINS AS MEMBER ∍ -- ∍ &#x220D
SET MINUS ∖ -- ∖ &#x2216
SUBSET OF (Sideways U with cap to left) ⊂ &sub; ⊂ &#x2282
SUPERSET OF (Sideways U with cap to right) ⊃ &sup; ⊃ &#x2283
NOT A SUBSET OF (Subset with Slash) ⊄ &nsub; ⊄ &#x2284
NOT A SUPERSET OF (Superset with slash) ⊅ -- ⊅ &#x2285
SUBSET OF OR EQUAL TO (Subset with line below) ⊆ &sube; ⊆ &#x2286
SUPERSET OF OR EQUAL TO (Superset with line below) ⊇ &supe; ⊇ &#x2287
NEITHER A SUBSET OF NOR EQUAL TO ⊈ -- ⊈ &#x2288
NEITHER A SUPERSET OF NOR EQUAL TO ⊉ -- ⊉ &#x2289
SUBSET OF WITH NOT EQUAL TO ⊊ -- ⊊ &#x228A
SUPERSET OF WITH NOT EQUAL TO ⊋ -- ⊋ &#x228B
DIAMOND OPERATOR 
(Possibility)		 ⋄ -- ⋄ &#x22C4
ASYMPTOTICALLY EQUAL TO 
One to one Correspondence		 ≃ -- ≃ &#x2243
NOT ASYMPTOTICALLY EQUAL TO ≄ -- ≄ &#x2244
MULTISET (U with arrow) ⊌ -- ⊌ &#x228C
MULTISET MULTIPLICATION (U with dot in center) ⊍ -- ⊍ &#x228D
MULTISET UNION (U with plus in center) ⊎ -- ⊎ &#x228E
DOUBLE SUBSET ⋐ -- ⋐ &#x22D0
DOUBLE SUPERSET ⋑ -- ⋑ &#x22D1
DOUBLE INTERSECTION ⋒ -- ⋒ &#x22D2
DOUBLE UNION ⋓ -- ⋓ &#x22D3
N-ARY LOGICAL AND ⋀ -- ⋀ &#x22C0
N-ARY LOGICAL OR ⋁ -- ⋁ &#x22C1
N-ARY INTERSECTION&cu ⋂ -- ⋂ &#x22C2
N-ARY UNION ⋃ -- ⋃ &#x22C3
CURLY LOGICAL OR ⋎ -- ⋎ &#x22CE
CURLY LOGICAL AND ⋏ -- ⋏ &#x22CF
CIRCLED PLUS (Direct Sum) ⊕ &oplus; ⊕ &#x2295
CIRCLED TIMES (Vector Product) ⊗ &otimes; ⊗ &#x2297
CIRCLED MINUS ⊖ -- ⊖ &#x2296
CIRCLED DIVISION SLASH ⊘ -- ⊘ &#x2298

Other Element Of Symbols

ELEMENT OF WITH LONG HORIZONTAL STROKE ⋲ ⋲ &#x22F2
ELEMENT OF WITH VERTICAL BAR AT END OF HORIZONTAL STROKE ⋳ ⋳ &#x22F3
SMALL ELEMENT OF WITH VERTICAL BAR AT END OF HORIZONTAL STROKE ⋴ ⋴ &#x22F4
ELEMENT OF WITH DOT ABOVE ⋵ ⋵ &#x22F5
ELEMENT OF WITH OVERBAR ⋶ ⋶ &#x22F6
SMALL ELEMENT OF WITH OVERBAR ⋷ ⋷ &#x22F7
ELEMENT OF WITH UNDERBAR ⋸ ⋸ &#x22F8
ELEMENT OF WITH TWO HORIZONTAL STROKES ⋹ ⋹ &#x22F9
CONTAINS WITH LONG HORIZONTAL STROKE ⋺ ⋺ &#x22FA
CONTAINS WITH VERTICAL BAR AT END OF HORIZONTAL STROKE ⋻ ⋻ &#x22FB
SMALL CONTAINS WITH VERTICAL BAR AT END OF HORIZONTAL STROKE ⋼ ⋼ &#x22FC
CONTAINS WITH OVERBAR ⋽ ⋽ &#x22FD
SMALL CONTAINS WITH OVERBAR ⋾ ⋾ &#x22FE
NOTATION BAG MEMBERSHIP ⋿ ⋿ &#x22FF

Geometric Symbols

Note: The entity code for the Angle Symbol (∠) is &ang; and the code for the perpendicular angle (⊥) is&perp;. 
Otherwise, these symbols have numeric codes only.

Angles and Lines

Character Name Character Num 
Entity		 Hex 
Entity
RIGHT ANGLE ∟ ∟ &#x221F
ANGLE 
Entity Code = &ang;		 ∠ ∠ &#x2220
MEASURED ANGLE ∡ ∡ &#x2221
SPHERICAL ANGLE ∢ ∢ &#x2222
DIVIDES ∣ ∣ &#x2223
DOES NOT DIVIDE ∤ ∤ &#x2224
PARALLEL TO ∥ ∥ &#x2225
NOT PARALLEL TO ∦ ∦ &#x2226
RIGHT ANGLE WITH ARC ⊾ ⊾ &#x22BE
RIGHT TRIANGLE ⊿ ⊿ &#x22BF
UP TACK (Perpendicular) 
Entity Code = &perp;		 ⊥ ⊥ &#x22A5
RIGHT TACK ⊢ ⊢ &#x22A2
LEFT TACK ⊣ ⊣ &#x22A3
DOWN TACK ⊤ ⊤ &#x22A4

Logical Proofs

Note: The entity code for the Therefore Symbol (∴) is &there4;. Otherwise, these symbols have numeric codes only.

Character Name Character Num 
Entity		 Hex 
Entity
THEREFORE (Triangular Dots) 
Entity Code = &there4;		 ∴ ∴ ∴
BECAUSE (Upside down Triangular Dots) ∵ ∵ &#x2235
PROPORTIONAL TO 
Entity Code = &prop;		 ∝ ∝ &#x221D
END OF PROOF (solid rectangle) ∎ ∎ &#x220E

Common Equivalence and Proportion Operators

Common Equivalence Operators

Character Name Character Entity Num 
Entity		 Hex 
Entity
NOT EQUALS ≠ &ne; ≠ ≠
APPROXIMATELY EQUAL ≅ &cong; ≅ ≅
ALMOST EQUAL (ASYMPTOTIC) ≈ &asymp; ≈ ≈
NOT ALMOST EQUAL TO ≉ -- ≉ &#x2249
TILDE SIMILAR TO ∼ &sim; ∼ ∼
IDENTICAL TO (three lines) ≡ &equiv; ≡ ≡
NOT IDENTICAL TO ≢ -- ≢ &#x2262

Other Equivalence Symbols

STRICTLY EQUIVALENT TO ≣ ≣ &#x2263
NOT IDENTICAL TO ≢ ≢ &#x2262
LESS-THAN OVER EQUAL TO ≦ ≦ &#x2266
GREATER-THAN OVER EQUAL TO ≧ ≧ &#x2267
LESS-THAN BUT NOT EQUAL TO ≨ ≨ &#x2268
GREATER-THAN BUT NOT EQUAL TO ≩ ≩ &#x2269
MUCH LESS-THAN ≪ ≪ &#x226A
MUCH GREATER-THAN ≫ ≫ &#x226B
BETWEEN ≬ ≬ &#x226C
NOT EQUIVALENT TO ≭ ≭ &#x226D
NOT LESS-THAN ≮ ≮ &#x226E
NOT GREATER-THAN ≯ ≯ &#x226F
NEITHER LESS-THAN NOR EQUAL TO ≰ ≰ &#x2270
NEITHER GREATER-THAN NOR EQUAL TO ≱ ≱ &#x2271
LESS-THAN OR EQUIVALENT TO ≲ ≲ &#x2272
GREATER-THAN OR EQUIVALENT TO ≳ ≳ &#x2273
NEITHER LESS-THAN NOR EQUIVALENT TO ≴ ≴ &#x2274
NEITHER GREATER-THAN NOR EQUIVALENT TO ≵ ≵ &#x2275
LESS-THAN OR GREATER-THAN ≶ ≶ &#x2276
GREATER-THAN OR LESS-THAN ≷ ≷ &#x2277
NEITHER LESS-THAN NOR GREATERTHAN ≸ ≸ &#x2278
NEITHER GREATER-THAN NOR LESSTHAN ≹ ≹ &#x2279
NOT TILDE ≁ ≁ &#x2241
MINUS TILDE ≂ ≂ &#x2242
ASYMPTOTICALLY EQUAL TO ≃ ≃ &#x2243
NOT ASYMPTOTICALLY EQUAL TO ≄ ≄ &#x2244
APPROXIMATELY BUT NOT ACTUALLY EQUAL TO ≆ ≆ &#x2246
NEITHER APPROXIMATELY NOR ACTUALLY EQUAL TO ≇ ≇ &#x2247
NOT ALMOST EQUAL TO ≉ ≉ &#x2249
ALMOST EQUAL OR EQUAL TO ≊ ≊ &#x224A
TRIPLE TILDE ≋ ≋ &#x224B
ALL EQUAL TO ≌ ≌ &#x224C

Unicode对照表参考了： http://blog.csdn.net/snowdust/article/details/5895593

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