Non spacing graphic characters (diacritics) are always used in conjunction with other spacing graphic characters. More than one non spacing graphic character may be associated with one spacing graphic character. In Unicode, these characters always follow the spacing character they modify. Display of some diacritic characters in the web depends on the ability of the font to display the character.
See also http://lcweb2.loc.gov/cocoon/codetables/45.html.
| Mnem | Mnemonic name | Unicode name | Unicode | Character |
| <_> | Underscore | Combining Low Line | 0332 | ̲ |
| <2_> | Double underscore | Combining Double Low Line | 0333 | ̳ |
| <2ac> | Double acute | Combining Double Acute Accent | 030B | ̋ |
| <2bd> | Double dot below | Combining Diaeresis Below | 0324 | ̤ |
| <2t1> | Double tilde part 1 | Combining Double Tilde (Was Combining Double Tilde Left Half) | 0360 (was FE22) | ͠ |
| <2t2> | Double tilde part 2 | Combining Double Tilde (Was Combining Double Tilde Right Half) | 0360 (was FE23) | ͠ |
| <ac> | Acute | Combining Acute Accent | 0301 | ́ |
| <ang> | Circle above | Combining Ring Above | 030A | ̊ |
| <bv> | Breve | Combining Breve | 0306 | ̆ |
| <ced> | Cedilla | Combining Cedilla | 0327 | ̧ |
| <cfx> | Circumflex | Combining Circumflex Accent | 0302 | ̂ |
| <cirb> | Circle below | Combining Ring Below | 0325 | ̥ |
| <cnd> | Candrabindu | Combining Candrabindu | 0310 | ̐ |
| <dotb> | Dot below | Combining Dot Below | 0323 | ̣ |
| <gv> | Grave | Combining Grave Accent | 0300 | ̀ |
| <hck> | Hacek | Combining Caron | 030C | ̌ |
| <hi,> | High centred comma | Combining Comma Above | 0313 | ̓ |
| <hi,o> | High off-centred comma | Combining Comma Above Right | 0315 | ̕ |
| <hi?> | Pseudo question | Combining Hook Above | 0309 | ̉ |
| <iced> | Right cedilla | Combining Left Half Ring Below | 031C | ̜ |
| <lhk> | Left hook | Combining Comma Below | 0326 | ̦ |
| <lig1> | Ligature part 1 | Combining Double Inverted Breve (Was Combining Ligature Left Half) | 0361 (was FE20) | ͡ |
| <lig2> | Ligature part 2 | Combining Double Inverted Breve (Was Combining Ligature Right Half) | 0361 (was FE21) | ͡ |
| <mac> | Macron | Combining Macron | 0304 | ̄ |
| <rhk> | Right hook | Combining Ogonek | 0328 | ̨ |
| <sdot> | Superior dot | Combining Dot Above | 0307 | ̇ |
| <tild> | Combining tilde | Combining Tilde | 0303 | ̃ |
| <uml> | Umlaut | Combining Diaeresis | 0308 | ̈ |
| <upd> | Upadhmaniya | Combining Breve Below | 032E | ̮ |