HTML5 实体名称（按字母排序）- U
旧版浏览器可能不支持下表中的所有 HTML5 实体。
Chrome 和 Opera 对此提供了良好的支持，IE 11+ 和 Firefox 35+ 支持所有实体。
| 字符 | 实体名称 | 十六进制 | 十进制 |
|---|---|---|---|
| Ú | Uacute | 000DA | 218 |
| ú | uacute | 000FA | 250 |
| ↟ | Uarr | 0219F | 8607 |
| ⇑ | uArr | 021D1 | 8657 |
| ↑ | uarr | 02191 | 8593 |
| ⥉ | Uarrocir | 02949 | 10569 |
| Ў | Ubrcy | 0040E | 1038 |
| ў | ubrcy | 0045E | 1118 |
| Ŭ | Ubreve | 0016C | 364 |
| ŭ | ubreve | 0016D | 365 |
| Û | Ucirc | 000DB | 219 |
| û | ucirc | 000FB | 251 |
| У | Ucy | 00423 | 1059 |
| у | ucy | 00443 | 1091 |
| ⇅ | udarr | 021C5 | 8645 |
| Ű | Udblac | 00170 | 368 |
| ű | udblac | 00171 | 369 |
| ⥮ | udhar | 0296E | 10606 |
| ⥾ | ufisht | 0297E | 10622 |
| 𝔘 | Ufr | 1D518 | 120088 |
| 𝔲 | ufr | 1D532 | 120114 |
| Ù | Ugrave | 000D9 | 217 |
| ù | ugrave | 000F9 | 249 |
| ⥣ | uHar | 02963 | 10595 |
| ↿ | uharl | 021BF | 8639 |
| ↾ | uharr | 021BE | 8638 |
| ▀ | uhblk | 02580 | 9600 |
| ⌜ | ulcorn | 0231C | 8988 |
| ⌜ | ulcorner | 0231C | 8988 |
| ⌏ | ulcrop | 0230F | 8975 |
| ◸ | ultri | 025F8 | 9720 |
| Ū | Umacr | 0016A | 362 |
| ū | umacr | 0016B | 363 |
| ¨ | uml | 000A8 | 168 |
| _ | UnderBar | 0005F | 95 |
| ⏟ | UnderBrace | 023DF | 9183 |
| ⎵ | UnderBracket | 023B5 | 9141 |
| ⏝ | UnderParenthesis | 023DD | 9181 |
| ⋃ | Union | 022C3 | 8899 |
| ⊎ | UnionPlus | 0228E | 8846 |
| Ų | Uogon | 00172 | 370 |
| ų | uogon | 00173 | 371 |
| 𝕌 | Uopf | 1D54C | 120140 |
| 𝕦 | uopf | 1D566 | 120166 |
| ↑ | UpArrow | 02191 | 8593 |
| ⇑ | Uparrow | 021D1 | 8657 |
| ↑ | uparrow | 02191 | 8593 |
| ⤒ | UpArrowBar | 02912 | 10514 |
| ⇅ | UpArrowDownArrow | 021C5 | 8645 |
| ↕ | UpDownArrow | 02195 | 8597 |
| ⇕ | Updownarrow | 021D5 | 8661 |
| ↕ | updownarrow | 02195 | 8597 |
| ⥮ | UpEquilibrium | 0296E | 10606 |
| ↿ | upharpoonleft | 021BF | 8639 |
| ↾ | upharpoonright | 021BE | 8638 |
| ⊎ | uplus | 0228E | 8846 |
| ↖ | UpperLeftArrow | 02196 | 8598 |
| ↗ | UpperRightArrow | 02197 | 8599 |
| ϒ | Upsi | 003D2 | 978 |
| υ | upsi | 003C5 | 965 |
| ϒ | upsih | 003D2 | 978 |
| Υ | Upsilon | 003A5 | 933 |
| υ | upsilon | 003C5 | 965 |
| ⊥ | UpTee | 022A5 | 8869 |
| ↥ | UpTeeArrow | 021A5 | 8613 |
| ⇈ | upuparrows | 021C8 | 8648 |
| ⌝ | urcorn | 0231D | 8989 |
| ⌝ | urcorner | 0231D | 8989 |
| ⌎ | urcrop | 0230E | 8974 |
| Ů | Uring | 0016E | 366 |
| ů | uring | 0016F | 367 |
| ◹ | urtri | 025F9 | 9721 |
| 𝒰 | Uscr | 1D4B0 | 119984 |
| 𝓊 | uscr | 1D4CA | 120010 |
| ⋰ | utdot | 022F0 | 8944 |
| Ũ | Utilde | 00168 | 360 |
| ũ | utilde | 00169 | 361 |
| ▵ | utri | 025B5 | 9653 |
| ▴ | utrif | 025B4 | 9652 |
| ⇈ | uuarr | 021C8 | 8648 |
| Ü | Uuml | 000DC | 220 |
| ü | uuml | 000FC | 252 |
| ⦧ | uwangle | 029A7 | 10663 |
