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  UTF-8 数学运算符

  • 定义和使用

    如果字符没有 HTML 实体，则可以使用十进制（dec）或十六进制（hex）引用。
    如果要在 HTML 中显示特殊字符，可以使用下表中的 HTML 实体。
    字符 十进制 十六进制 实体 名称
    ∀ 8704 2200 ∀ FOR ALL
    ∁ 8705 2201   COMPLEMENT
    ∂ 8706 2202 ∂ PARTIAL DIFFERENTIAL
    ∃ 8707 2203 ∃ THERE EXISTS
    ∄ 8708 2204   THERE DOES NOT EXIST
    ∅ 8709 2205 ∅ EMPTY SET
    ∆ 8710 2206   INCREMENT
    ∇ 8711 2207 ∇ NABLA
    ∈ 8712 2208 ∈ ELEMENT OF
    ∉ 8713 2209 ∉ NOT AN ELEMENT OF
    ∊ 8714 220A   SMALL ELEMENT OF
    ∋ 8715 220B ∋ CONTAINS AS MEMBER
    ∌ 8716 220C   DOES NOT CONTAIN AS MEMBER
    ∍ 8717 220D   SMALL CONTAINS AS MEMBER
    ∎ 8718 220E   END OF PROOF
    ∏ 8719 220F ∏ N-ARY PRODUCT
    ∐ 8720 2210   N-ARY COPRODUCT
    ∑ 8721 2211 ∑ N-ARY SUMMATION
    − 8722 2212 − MINUS SIGN
    ∓ 8723 2213   MINUS-OR-PLUS SIGN
    ∔ 8724 2214   DOT PLUS
    ∕ 8725 2215   DIVISION SLASH
    ∖ 8726 2216   SET MINUS
    ∗ 8727 2217 ∗ ASTERISK OPERATOR
    ∘ 8728 2218   RING OPERATOR
    ∙ 8729 2219   BULLET OPERATOR
    √ 8730 221A √ SQUARE ROOT
    ∛ 8731 221B   CUBE ROOT
    ∜ 8732 221C   FOURTH ROOT
    ∝ 8733 221D ∝ PROPORTIONAL TO
    ∞ 8734 221E ∞ INFINITY
    ∟ 8735 221F   RIGHT ANGLE
    ∠ 8736 2220 ∠ ANGLE
    ∡ 8737 2221   MEASURED ANGLE
    ∢ 8738 2222   SPHERICAL ANGLE
    ∣ 8739 2223   DIVIDES
    ∤ 8740 2224   DOES NOT DIVIDE
    ∥ 8741 2225   PARALLEL TO
    ∦ 8742 2226   NOT PARALLEL TO
    ∧ 8743 2227 ∧ LOGICAL AND
    ∨ 8744 2228 ∨ LOGICAL OR
    ∩ 8745 2229 ∩ INTERSECTION
    ∪ 8746 222A ∪ UNION
    ∫ 8747 222B ∫ INTEGRAL
    ∬ 8748 222C   DOUBLE INTEGRAL
    ∭ 8749 222D   TRIPLE INTEGRAL
    ∮ 8750 222E   CONTOUR INTEGRAL
    ∯ 8751 222F   SURFACE INTEGRAL
    ∰ 8752 2230   VOLUME INTEGRAL
    ∱ 8753 2231   CLOCKWISE INTEGRAL
    ∲ 8754 2232   CLOCKWISE CONTOUR INTEGRAL
    ∳ 8755 2233   ANTICLOCKWISE CONTOUR INTEGRAL
    ∴ 8756 2234 ∴ THEREFORE
    ∵ 8757 2235   BECAUSE
    ∶ 8758 2236   RATIO
    ∷ 8759 2237   PROPORTION
    ∸ 8760 2238   DOT MINUS
    ∹ 8761 2239   EXCESS
    ∺ 8762 223A   GEOMETRIC PROPORTION
    ∻ 8763 223B   HOMOTHETIC
    ∼ 8764 223C ∼ TILDE OPERATOR
    ∽ 8765 223D   REVERSED TILDE
    ∾ 8766 223E   INVERTED LAZY S
    ∿ 8767 223F   SINE WAVE
    ≀ 8768 2240   WREATH PRODUCT
    ≁ 8769 2241   NOT TILDE
    ≂ 8770 2242   MINUS TILDE
    ≃ 8771 2243   ASYMPTOTICALLY EQUAL TO
    ≄ 8772 2244   NOT ASYMPTOTICALLY EQUAL TO
    ≅ 8773 2245 ≅ APPROXIMATELY EQUAL TO
    ≆ 8774 2246   APPROXIMATELY BUT NOT ACTUALLY EQUAL TO
    ≇ 8775 2247   NEITHER APPROXIMATELY NOR ACTUALLY EQUAL TO
    ≈ 8776 2248 ≈ ALMOST EQUAL TO
    ≉ 8777 2249   NOT ALMOST EQUAL TO
    ≊ 8778 224A   ALMOST EQUAL OR EQUAL TO
    ≋ 8779 224B   TRIPLE TILDE
    ≌ 8780 224C   ALL EQUAL TO
    ≍ 8781 224D   EQUIVALENT TO
    ≎ 8782 224E   GEOMETRICALLY EQUIVALENT TO
    ≏ 8783 224F   DIFFERENCE BETWEEN
    ≐ 8784 2250   APPROACHES THE LIMIT
    ≑ 8785 2251   GEOMETRICALLY EQUAL TO
    ≒ 8786 2252   APPROXIMATELY EQUAL TO OR THE IMAGE OF
    ≓ 8787 2253   IMAGE OF OR APPROXIMATELY EQUAL TO
    ≔ 8788 2254   COLON EQUALS
    ≕ 8789 2255   EQUALS COLON
    ≖ 8790 2256   RING IN EQUAL TO
    ≗ 8791 2257   RING EQUAL TO
    ≘ 8792 2258   CORRESPONDS TO
    ≙ 8793 2259   ESTIMATES
    ≚ 8794 225A   EQUIANGULAR TO
    ≛ 8795 225B   STAR EQUALS
    ≜ 8796 225C   DELTA EQUAL TO
    ≝ 8797 225D   EQUAL TO BY DEFINITION
    ≞ 8798 225E   MEASURED BY
    ≟ 8799 225F   QUESTIONED EQUAL TO
    ≠ 8800 2260 ≠ NOT EQUAL TO
    ≡ 8801 2261 ≡ IDENTICAL TO
    ≢ 8802 2262   NOT IDENTICAL TO
    ≣ 8803 2263   STRICTLY EQUIVALENT TO
    ≤ 8804 2264 ≤ LESS-THAN OR EQUAL TO
    ≥ 8805 2265 ≥ GREATER-THAN OR EQUAL TO
    ≦ 8806 2266   LESS-THAN OVER EQUAL TO
    ≧ 8807 2267   GREATER-THAN OVER EQUAL TO
    ≨ 8808 2268   LESS-THAN BUT NOT EQUAL TO
    ≩ 8809 2269   GREATER-THAN BUT NOT EQUAL TO
    ≪ 8810 226A   MUCH LESS-THAN
    ≫ 8811 226B   MUCH GREATER-THAN
    ≬ 8812 226C   BETWEEN
    ≭ 8813 226D   NOT EQUIVALENT TO
    ≮ 8814 226E   NOT LESS-THAN
    ≯ 8815 226F   NOT GREATER-THAN
    ≰ 8816 2270   NEITHER LESS-THAN NOR EQUAL TO
    ≱ 8817 2271   NEITHER GREATER-THAN NOR EQUAL TO
    ≲ 8818 2272   LESS-THAN OR EQUIVALENT TO
    ≳ 8819 2273   GREATER-THAN OR EQUIVALENT TO
    ≴ 8820 2274   NEITHER LESS-THAN NOR EQUIVALENT TO
    ≵ 8821 2275   NEITHER GREATER-THAN NOR EQUIVALENT TO
    ≶ 8822 2276   LESS-THAN OR GREATER-THAN
    ≷ 8823 2277   GREATER-THAN OR LESS-THAN
    ≸ 8824 2278   NEITHER LESS-THAN NOR GREATER-THAN
    ≹ 8825 2279   NEITHER GREATER-THAN NOR LESS-THAN
    ≺ 8826 227A   PRECEDES
    ≻ 8827 227B   SUCCEEDS
    ≼ 8828 227C   PRECEDES OR EQUAL TO
    ≽ 8829 227D   SUCCEEDS OR EQUAL TO
    ≾ 8830 227E   PRECEDES OR EQUIVALENT TO
    ≿ 8831 227F   SUCCEEDS OR EQUIVALENT TO
    ⊀ 8832 2280   DOES NOT PRECEDE
    ⊁ 8833 2281   DOES NOT SUCCEED
    ⊂ 8834 2282 ⊂ SUBSET OF
    ⊃ 8835 2283 ⊃ SUPERSET OF
    ⊄ 8836 2284 ⊄ NOT A SUBSET OF
    ⊅ 8837 2285   NOT A SUPERSET OF
    ⊆ 8838 2286 ⊆ SUBSET OF OR EQUAL TO
    ⊇ 8839 2287 ⊇ SUPERSET OF OR EQUAL TO
    ⊈ 8840 2288   NEITHER A SUBSET OF NOR EQUAL TO
    ⊉ 8841 2289   NEITHER A SUPERSET OF NOR EQUAL TO
    ⊊ 8842 228A   SUBSET OF WITH NOT EQUAL TO
    ⊋ 8843 228B   SUPERSET OF WITH NOT EQUAL TO
    ⊌ 8844 228C   MULTISET
    ⊍ 8845 228D   MULTISET MULTIPLICATION
    ⊎ 8846 228E   MULTISET UNION
    ⊏ 8847 228F   SQUARE IMAGE OF
    ⊐ 8848 2290   SQUARE ORIGINAL OF
    ⊑ 8849 2291   SQUARE IMAGE OF OR EQUAL TO
    ⊒ 8850 2292   SQUARE ORIGINAL OF OR EQUAL TO
    ⊓ 8851 2293   SQUARE CAP
    ⊔ 8852 2294   SQUARE CUP
    ⊕ 8853 2295 ⊕ CIRCLED PLUS
    ⊖ 8854 2296   CIRCLED MINUS
    ⊗ 8855 2297 ⊗ CIRCLED TIMES
    ⊘ 8856 2298   CIRCLED DIVISION SLASH
    ⊙ 8857 2299   CIRCLED DOT OPERATOR
    ⊚ 8858 229A   CIRCLED RING OPERATOR
    ⊛ 8859 229B   CIRCLED ASTERISK OPERATOR
    ⊜ 8860 229C   CIRCLED EQUALS
    ⊝ 8861 229D   CIRCLED DASH
    ⊞ 8862 229E   SQUARED PLUS
    ⊟ 8863 229F   SQUARED MINUS
    ⊠ 8864 22A0   SQUARED TIMES
    ⊡ 8865 22A1   SQUARED DOT OPERATOR
    ⊢ 8866 22A2   RIGHT TACK
    ⊣ 8867 22A3   LEFT TACK
    ⊤ 8868 22A4   DOWN TACK
    ⊥ 8869 22A5 ⊥ UP TACK
    ⊦ 8870 22A6   ASSERTION
    ⊧ 8871 22A7   MODELS
    ⊨ 8872 22A8   TRUE
    ⊩ 8873 22A9   FORCES
    ⊪ 8874 22AA   TRIPLE VERTICAL BAR RIGHT TURNSTILE
    ⊫ 8875 22AB   DOUBLE VERTICAL BAR DOUBLE RIGHT TURNSTILE
    ⊬ 8876 22AC   DOES NOT PROVE
    ⊭ 8877 22AD   NOT TRUE
    ⊮ 8878 22AE   DOES NOT FORCE
    ⊯ 8879 22AF   NEGATED DOUBLE VERTICAL BAR DOUBLE RIGHT TURNSTILE
    ⊰ 8880 22B0   PRECEDES UNDER RELATION
    ⊱ 8881 22B1   SUCCEEDS UNDER RELATION
    ⊲ 8882 22B2   NORMAL SUBGROUP OF
    ⊳ 8883 22B3   CONTAINS AS NORMAL SUBGROUP
    ⊴ 8884 22B4   NORMAL SUBGROUP OF OR EQUAL TO
    ⊵ 8885 22B5   CONTAINS AS NORMAL SUBGROUP OR EQUAL TO
    ⊶ 8886 22B6   ORIGINAL OF
    ⊷ 8887 22B7   IMAGE OF
    ⊸ 8888 22B8   MULTIMAP
    ⊹ 8889 22B9   HERMITIAN CONJUGATE MATRIX
    ⊺ 8890 22BA   INTERCALATE
    ⊻ 8891 22BB   XOR
    ⊼ 8892 22BC   NAND
    ⊽ 8893 22BD   NOR
    ⊾ 8894 22BE   RIGHT ANGLE WITH ARC
    ⊿ 8895 22BF   RIGHT TRIANGLE
    ⋀ 8896 22C0   N-ARY LOGICAL AND
    ⋁ 8897 22C1   N-ARY LOGICAL OR
    ⋂ 8898 22C2   N-ARY INTERSECTION
    ⋃ 8899 22C3   N-ARY UNION
    ⋄ 8900 22C4   DIAMOND OPERATOR
    ⋅ 8901 22C5 ⋅ DOT OPERATOR
    ⋆ 8902 22C6   STAR OPERATOR
    ⋇ 8903 22C7   DIVISION TIMES
    ⋈ 8904 22C8   BOWTIE
    ⋉ 8905 22C9   LEFT NORMAL FACTOR SEMIDIRECT PRODUCT
    ⋊ 8906 22CA   RIGHT NORMAL FACTOR SEMIDIRECT PRODUCT
    ⋋ 8907 22CB   LEFT SEMIDIRECT PRODUCT
    ⋌ 8908 22CC   RIGHT SEMIDIRECT PRODUCT
    ⋍ 8909 22CD   REVERSED TILDE EQUALS
    ⋎ 8910 22CE   CURLY LOGICAL OR
    ⋏ 8911 22CF   CURLY LOGICAL AND
    ⋐ 8912 22D0   DOUBLE SUBSET
    ⋑ 8913 22D1   DOUBLE SUPERSET
    ⋒ 8914 22D2   DOUBLE INTERSECTION
    ⋓ 8915 22D3   DOUBLE UNION
    ⋔ 8916 22D4   PITCHFORK
    ⋕ 8917 22D5   EQUAL AND PARALLEL TO
    ⋖ 8918 22D6   LESS-THAN WITH DOT
    ⋗ 8919 22D7   GREATER-THAN WITH DOT
    ⋘ 8920 22D8   VERY MUCH LESS-THAN
    ⋙ 8921 22D9   VERY MUCH GREATER-THAN
    ⋚ 8922 22DA   LESS-THAN EQUAL TO OR GREATER-THAN
    ⋛ 8923 22DB   GREATER-THAN EQUAL TO OR LESS-THAN
    ⋜ 8924 22DC   EQUAL TO OR LESS-THAN
    ⋝ 8925 22DD   EQUAL TO OR GREATER-THAN
    ⋞ 8926 22DE   EQUAL TO OR PRECEDES
    ⋟ 8927 22DF   EQUAL TO OR SUCCEEDS
    ⋠ 8928 22E0   DOES NOT PRECEDE OR EQUAL
    ⋡ 8929 22E1   DOES NOT SUCCEED OR EQUAL
    ⋢ 8930 22E2   NOT SQUARE IMAGE OF OR EQUAL TO
    ⋣ 8931 22E3   NOT SQUARE ORIGINAL OF OR EQUAL TO
    ⋤ 8932 22E4   SQUARE IMAGE OF OR NOT EQUAL TO
    ⋥ 8933 22E5   SQUARE ORIGINAL OF OR NOT EQUAL TO
    ⋦ 8934 22E6   LESS-THAN BUT NOT EQUIVALENT TO
    ⋧ 8935 22E7   GREATER-THAN BUT NOT EQUIVALENT TO
    ⋨ 8936 22E8   PRECEDES BUT NOT EQUIVALENT TO
    ⋩ 8937 22E9   SUCCEEDS BUT NOT EQUIVALENT TO
    ⋪ 8938 22EA   NOT NORMAL SUBGROUP OF
    ⋫ 8939 22EB   DOES NOT CONTAIN AS NORMAL SUBGROUP
    ⋬ 8940 22EC   NOT NORMAL SUBGROUP OF OR EQUAL TO
    ⋭ 8941 22ED   DOES NOT CONTAIN AS NORMAL SUBGROUP OR EQUAL
    ⋮ 8942 22EE   VERTICAL ELLIPSIS
    ⋯ 8943 22EF   MIDLINE HORIZONTAL ELLIPSIS
    ⋰ 8944 22F0   UP RIGHT DIAGONAL ELLIPSIS
    ⋱ 8945 22F1   DOWN RIGHT DIAGONAL ELLIPSIS
    ⋲ 8946 22F2   ELEMENT OF WITH LONG HORIZONTAL STROKE
    ⋳ 8947 22F3   ELEMENT OF WITH VERTICAL BAR AT END OF HORIZONTAL STROKE
    ⋴ 8948 22F4   SMALL ELEMENT OF WITH VERTICAL BAR AT END OF HORIZONTAL STROKE
    ⋵ 8949 22F5   ELEMENT OF WITH DOT ABOVE
    ⋶ 8950 22F6   ELEMENT OF WITH OVERBAR
    ⋷ 8951 22F7   SMALL ELEMENT OF WITH OVERBAR
    ⋸ 8952 22F8   ELEMENT OF WITH UNDERBAR
    ⋹ 8953 22F9   ELEMENT OF WITH TWO HORIZONTAL STROKES
    ⋺ 8954 22FA   CONTAINS WITH LONG HORIZONTAL STROKE
    ⋻ 8955 22FB   CONTAINS WITH VERTICAL BAR AT END OF HORIZONTAL STROKE
    ⋼ 8956 22FC   SMALL CONTAINS WITH VERTICAL BAR AT END OF HORIZONTAL STROKE
    ⋽ 8957 22FD   CONTAINS WITH OVERBAR
    ⋾ 8958 22FE   SMALL CONTAINS WITH OVERBAR
    ⋿ 8959 22FF   Z NOTATION BAG MEMBERSHIP
    注意：较旧的浏览器可能不支持上表中的所有HTML5实体。 Chrome具有良好的支持。 但是（当前）只有IE 11+和Firefox 35+支持所有实体。

  • 示例

    <p>I will display &sum;</p>
<p>I will display &#8721;</p>
<p>I will display &#x2211;</p>
    显示结果为： 
    I will display ∑

I will display ∑

I will display ∑
    尝试一下
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