XML与HTML字符实体引用列表
HTML中的字符实体引用

| exist | ∃ | U+2203 (8707) | HTML 4.0 | HTMLsymbol | ISOtech | 存在量词 |
| empty | ∅ | U+2205 (8709) | HTML 4.0 | HTMLsymbol | ISOamso | 空集 |
| nabla | ∇ | U+2207 (8711) | HTML 4.0 | HTMLsymbol | ISOtech | 劈形算子(倒三角算子) |
| isin | ∈ | U+2208 (8712) | HTML 4.0 | HTMLsymbol | ISOtech | 属于，是...的元素 |
| notin | ∉ | U+2209 (8713) | HTML 4.0 | HTMLsymbol | ISOtech | 不属于，不是...的元素 |
| ni | ∋ | U+220B (8715) | HTML 4.0 | HTMLsymbol | ISOtech | 包含...作为元素 |
| prod | ∏ | U+220F (8719) | HTML 4.0 | HTMLsymbol | ISOamsb | 连乘符号  |
| sum | ∑ | U+2211 (8721) | HTML 4.0 | HTMLsymbol | ISOamsb | 求和符号 |
| minus | − | U+2212 (8722) | HTML 4.0 | HTMLsymbol | ISOtech | 减号 |
| lowast | ∗ | U+2217 (8727) | HTML 4.0 | HTMLsymbol | ISOtech | 星算符 |
| radic | √ | U+221A (8730) | HTML 4.0 | HTMLsymbol | ISOtech | 平方根符号 |
| prop | ∝ | U+221D (8733) | HTML 4.0 | HTMLsymbol | ISOtech | 正比于 |
| infin | ∞ | U+221E (8734) | HTML 4.0 | HTMLsymbol | ISOtech | 无穷符号 |
| ang | ∠ | U+2220 (8736) | HTML 4.0 | HTMLsymbol | ISOamso | 角符号 |
| and | ∧ | U+2227 (8743) | HTML 4.0 | HTMLsymbol | ISOtech | 逻辑合取符号 (= wedge) |
| or | ∨ | U+2228 (8744) | HTML 4.0 | HTMLsymbol | ISOtech | 逻辑析取符号 (= vee) |
| cap | ∩ | U+2229 (8745) | HTML 4.0 | HTMLsymbol | ISOtech | 集合的交符号 (= cap) |
| cup | ∪ | U+222A (8746) | HTML 4.0 | HTMLsymbol | ISOtech | 集合的并符号 (= cup) |
| int | ∫ | U+222B (8747) | HTML 4.0 | HTMLsymbol | ISOtech | 积分符号 |
| there4 | ∴ | U+2234 (8756) | HTML 4.0 | HTMLsymbol | ISOtech | 所以符号 |
| sim | ∼ | U+223C (8764) | HTML 4.0 | HTMLsymbol | ISOtech | tilde算符 (等价于，渐进相等，近似等于，服从...概率分布)) |
| cong | ≅ | U+2245 (8773) | HTML 4.0 | HTMLsymbol | ISOtech | 全等符号 |
| asymp | ≈ | U+2248 (8776) | HTML 4.0 | HTMLsymbol | ISOamsr | 渐近相等 |
| ne | ≠ | U+2260 (8800) | HTML 4.0 | HTMLsymbol | ISOtech | 不等 |
| equiv | ≡ | U+2261 (8801) | HTML 4.0 | HTMLsymbol | ISOtech | 等价 |
| le | ≤ | U+2264 (8804) | HTML 4.0 | HTMLsymbol | ISOtech | 小于等于 |
| ge | ≥ | U+2265 (8805) | HTML 4.0 | HTMLsymbol | ISOtech | 大于等于 |
| sub | ⊂ | U+2282 (8834) | HTML 4.0 | HTMLsymbol | ISOtech | 是...的子集 |
| sup | ⊃ | U+2283 (8835) | HTML 4.0 | HTMLsymbol | ISOtech | 是...的超集 |
| nsub | ⊄ | U+2284 (8836) | HTML 4.0 | HTMLsymbol | ISOamsn | 不是...的子集 |
| sube | ⊆ | U+2286 (8838) | HTML 4.0 | HTMLsymbol | ISOtech | 是...的子集或相等 |
| supe | ⊇ | U+2287 (8839) | HTML 4.0 | HTMLsymbol | ISOtech | 是...的超集或相等 |
| oplus | ⊕ | U+2295 (8853) | HTML 4.0 | HTMLsymbol | ISOamsb | 圈加号 (= 直和) |
| otimes | ⊗ | U+2297 (8855) | HTML 4.0 | HTMLsymbol | ISOamsb | 圈乘号 (= 向量积符号) |
| perp | ⊥ | U+22A5 (8869) | HTML 4.0 | HTMLsymbol | ISOtech | 正交符号 = 垂直) |
| sdot | ⋅ | U+22C5 (8901) | HTML 4.0 | HTMLsymbol | ISOamsb | 点算符 |
| lceil | ⌈ | U+2308 (8968) | HTML 4.0 | HTMLsymbol | ISOamsc | 左天花板符号 |
| rceil | ⌉ | U+2309 (8969) | HTML 4.0 | HTMLsymbol | ISOamsc | 右天花板符号 |
| lfloor | ⌊ | U+230A (8970) | HTML 4.0 | HTMLsymbol | ISOamsc | 左地板符号 |
| rfloor | ⌋ | U+230B (8971) | HTML 4.0 | HTMLsymbol | ISOamsc | 右地板符号 |
| lang | 〈 | U+2329 (9001) | HTML 4.0 | HTMLsymbol | ISOtech | 角形左括号 |
| rang | 〉 | U+232A (9002) | HTML 4.0 | HTMLsymbol | ISOtech | 角形右括号 |
| loz | ◊ | U+25CA (9674) | HTML 4.0 | HTMLsymbol | ISOpub | 菱形符号（钻石符号） |
| spades | ♠ | U+2660 (9824) | HTML 4.0 | HTMLsymbol | ISOpub | 黑桃符号 |
| clubs | ♣ | U+2663 (9827) | HTML 4.0 | HTMLsymbol | ISOpub | 梅花符号 (= shamrock) |
| hearts | ♥ | U+2665 (9829) | HTML 4.0 | HTMLsymbol | ISOpub | 红桃符号 (= valentine) |
| diams | ♦ | U+2666 (9830) | HTML 4.0 | HTMLsymbol | ISOpub | 扑克牌方块符号 |
Notes:
↑ DTD: the full public DTD name (where the character entity name is defined) is actually mapped from one of the following three defined named entities:
HTMLlat1 maps to:
PUBLIC "-//W3C//ENTITIES Latin 1//EN//HTML" in HTML (the DTD is implicitly defined, no system URI is needed);
PUBLIC "-//W3C//ENTITIES Latin 1 for XHTML//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml-lat1.ent" in XHTML 1.0;
HTMLsymbol maps to:
PUBLIC "-//W3C//ENTITIES Symbols//EN//HTML" in HTML (the DTD is implicitly defined, no system URI is needed);
PUBLIC "-//W3C//ENTITIES Symbols for XHTML//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml-symbol.ent" in XHTML 1.0;
HTMLspecial maps to:
PUBLIC "-//W3C//ENTITIES Special//EN//HTML" in HTML (the DTD is implicitly defined, no system URI is needed);
PUBLIC "-//W3C//ENTITIES Special for XHTML//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml-special.ent" in XHTML 1.0.
↑  Old ISO subset: these are old (documented) character subsets used in legacy encodings before the unification within ISO 10646.
↑  描述: ISO 10646与Unicode字符名称写在前面，其它常用同义项写在后面
1 2 3 4  空间: 蓝色背景表示空格的宽度.
1 2  ligature: this is a standard misnomer as this is a separate character in some languages.
1 2  ISO proposed: these characters have been standardized in ISO 10646 after the release of HTML 4.0.
↑  alefsym: 阿列夫符号并不等同于U+05D0 '希伯来字母阿列夫', 虽然二字字形几乎相同.
↑  lArr: 根据ISO 10646，向左双线箭头还可用于'is implied by'（由...推导出）箭头.
↑  rArr: 根据ISO 10646，向左双线箭头还可用于'implies'（推导出）箭头.
↑  prod: '连乘符号'不同于U+03A0 '希腊大写字母Pi'，虽然二者字形几乎相同.
↑  sum: '求和符号'不同于U+03A3 '希腊大写字母Sigma'，虽然二者字形几乎相同.
↑  sim: 'tilde算符'不同于U+007E 'tilde'(波浪号), 虽然二者字形近似。但是波浪号可以从标准键盘直接输入，而且在ASCII中有编码。
↑  sup: 注意到nsup, U+2283 'not a superset of'（不是...的超集）, 并没有被包含进HTML字符实体引用之中. 看起来不够对称，不够完美吧? 它在ISOamsn子集中.
↑  perp: Unicode定义了U+22A5作为"up tack"(向上的大头钉), 以及U+27C2作为"perpendicular" (垂直符号). 这两个符号看起来几乎是一样的，但它们是不同的Unicode字符. 但是, HTML使用U+22A5作为"perpendicular"(垂直符号). 这就在HTML与Unicode之间产生了矛盾.
↑  sdot: 'dot operator'(点算符)不同于U+00B7 'middle dot'(中点符号).
↑  lang: 'left-pointing angle bracket'不同于这些字符：U+003C 'less than', U+2039 'single left-pointing angle quotation mark', U+2329 'left-pointing angle bracket', U+27E8 'mathematical left angle bracket', or U+3008 'left angle bracket' ，虽然这些字符看起来都差不多.
↑  rang: 'right-pointing angle bracket'不同于这些字符：U+003E 'greater than', U+203A 'single right-pointing angle quotation mark', U+232A 'right-pointing angle bracket', U+27E9 'mathematical right angle bracket', or U+3009 'right angle bracket' ，虽然这些字符看起来都差不多.
1 2 3 4  black: here it seems to mean filled as opposed to hollow.