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The character set of the ISSN records is built on the international standards ISO 646 and ISO 5426. A combination of the two sets was carried out in accordance with the rules laid down by section 6 of the ISO 2022 standard.
Equivalence with the Unicode characters is also given in the table below. The representation of the characters being here ensured by Unicode entities, it depends on the presence of the suitable font on the user's system.
| ASCII code | internal coding | glyph representation | Unicode value | Unicode entity (HTML) | Designation | Unicode designation (if different) |
| 161 | ¡ | U+00A1 | ¡ | spanish open exclamation mark | ||
| 162 | " | U+201E | „ | double open quotes (low position) | ||
| 163 | àlb | £ | U+00A3 | £ | Pound sign | |
| 164 | àus | $ | U+0024 | $ | Dollar sign | |
| 165 | ¥ | U+00A5 | ¥ | Yen sign | ||
| 166 | † | U+2020 | † | Single dagger | ||
| 167 | § | U+00A7 | § | Section or paragraph mark | ||
| 168 | ′ | U+2032 | ′ | Prime | PRIME=minutes=feet ?MODIFIER LETTER PRIME (U+02B9) | |
| 169 | ' | U+2018 | ‘ | Single open quote | LEFT SINGLE QUOTATION MARK = single turned comma quotation mark (this is the preferred character for opening single quotation mark) | |
| 170 | àgc | " | U+201C | “ | Double open quote (high position) | |
| 171 | « | U+00AB | « | open quote | ||
| 172 | â™ | U+266D | ♭ | flat | ||
| 173 | © | U+00A9 | © | copyright | ||
| 174 | â"- | U+2117 | ℗ | phonograph | ||
| 175 | ® | U+00AE | ® | Registered Trade Mark | ||
| 176 | à` | Ê¿ | U+02BF | ʿ | Ayn | MODIFIER LETTER LEFT HALF RING (transliteration of Arabic ain) |
| 177 | à' | ʾ | U+02BE | ʾ | Hamzah | MODIFIER LETTER RIGHT HALF RING (transliteration of Arabic hamzah) |
| 178 | ' | U+201A | ‚ | Single open quote (low position) | ||
| 179 | na | na | ||||
| 180 | na | na | ||||
| 181 | na | na | ||||
| 182 | ‡ | U+2021 | ‡ | Double dagger | ||
| 183 | àpm | · | U+00B7 | · | Middle dot | MIDDLE DOT = georgian comma = Greek middle dot |
| 184 | ″ | U+2033 | ″ | Double prime | DOUBLE PRIME = seconds = inches | |
| 185 | ' | U+2019 | ’ | Single closed quote | RIGHT SINGLE QUOTATION MARK = single comma quotation mark (this is the preferred character for closing single quotation mark) | |
| 186 | àgf | " | U+201D | ” | Double closed quote (high position) | RIGHT DOUBLE QUOTATION MARK = double comma quotation mark (this is the preferred character for closing quotation mark) |
| 187 | » | U+00BB | » | closed quotes | ||
| 188 | ♯ | U+266F | ♯ | sharp | ||
| 189 | ൠ| ʹ | U+02B9 | ʹ | Miagkii Znak | MODIFIER LETTER PRIME (translitteration of mjagkij znak) |
| 190 | àgd | ʺ | U+02BA | ʺ | Tverdyi Znak | MODIFIER LETTER DOUBLE PRIME (translitteration of tverdyj znak) |
| 191 | à? | ¿ | U+00BF | ¿ | Spanish open question mark | |
| 192 | ả | U+0309 | ̉ | Pseudo Question (accent) | COMBINING HOOK ABOVE (kerns left or right of circumflex over vowels; Vietnamese tone mark) | |
| 193 | à> | aÌ€ | U+0300 | ̀ | Grave | COMBINING GRAVE ACCENT |
| 194 | à< | aÌ | U+0301 | ́ | Acute | COMBINING ACUTE ACCENT |
| 195 | à= | aÌ' | U+0302 | ̂ | Circumflex | COMBINING CIRCUMFLEX ACCENT |
| 196 | àn | ã | U+0303 | ̃ | Tilde | COMBINING TILDE (Vietnamese tone mark) |
| 197 | à-s | aÌ" | U+0304 | ̄ | Macron | COMBINING MACRON |
| 198 | àr | ă | U+0306 | ̆ | Breve | COMBINING BREVE |
| 199 | à: | ȧ | U+0307 | ̇ | Dot above | COMBINING DOT ABOVE |
| 200 | ࣠| ä | U+0308 | ̈ | Trema, Diaeresis | COMBINING DIAERESIS = double dot above = umlaut |
| 201 | ࣠| ä | U+0308 | ̈ | Umlaut | COMBINING DIAERESIS = double dot above = umlaut |
| 202 | à* | aÌŠ | U+030A | ̊ | Circle above | COMBINING RING ABOVE |
| 203 | aÌ• | U+0315 | ̕ | High comma off centre | COMBINING COMMA ABOVE RIGHT | |
| 204 | à,i | aÌ' | U+0312 | ̒ | High comma centered | COMBINING TURNED COMMA ABOVE = cedilla above (Latvian) |
| 205 | à" | aÌ‹ | U+030B | ̋ | Double acute | COMBINING DOUBLE ACUTE ACCENT (Hungarian, Chuvash) |
| 206 | àTL | aÌ› | U+031B | ̛ | Tail | COMBINING HORN (Vietnamese) |
| 207 | àv | aÌŒ | U+030C | ̌ | Hacek | COMBINING CARON =non-spacing hacek) |
| 208 | àc | a̧ | U+0327 | ̧ | Cedilla | COMBINING CEDILLA |
| 209 | Rude | |||||
| 210 | às | a̘ | U+0318 | ̘ | Left hook | COMBINING LEFT TACK BELOW |
| 211 | àh | ą | U+0328 | ̨ | Right hook | COMBINING OGONEK |
| 212 | aÌ¥ | U+0325 | ̥ | Circle below | COMBING RING BELOW (Madurese) | |
| 213 | aÌ® | U+032E | ̮ | Half circle below | COMBINING BREVE BELOW | |
| 214 | àps | aÌ£ | U+0323 | ̣ | Dot below | COMBINING DOT BELOW (Vietnamese tone mark) |
| 215 | àti | a̤ | U+0324 | ̤ | Double dot below | COMBINING DIERESIS BELOW |
| 216 | à-i | a̲ | U+0332 | ̲ | Underline | |
| 217 | a̳ | U+0333 | ̳ | Double Underline | ||
| 218 | aÌ© | U+0329 | ̩ | Vertical bar | COMBINING VERTICAL LINE BELOW (Yoruba) | |
| 219 | aÌ | U+032D | ̭ | Circumflex below | COMBINING CIRCUMFLEX ACCENT BELOW | |
| 220 | na | na | ||||
| 221 | a︢e | U+FE22 | ︢ | Ligature/Double tilde 1 | COMBINING DOUDLE TILDE LEFT HALF | |
| 221 | aï¸ e | U+FE20 | ︠ | Ligature/Double tilde 1 | COMBINING LIGATURE LEFT HALF | |
| 222 | a︡e? | U+FE21 | ︡ | Ligature 2 | COMBINING LIGATURE RIGHT HALF | |
| 223 | a︣e? | U+FE23 | ︣ | Double Tilde 2 | COMBINING DOUBLE TILDE RIGHT HALF | |
| 224 | na | na | ||||
| 225 | àAE | Æ | U+00C6 | Æ | Ligature AE (upper case) | |
| 226 | àD- | Ð | U+00D0 | Ð | Icelandic D (upper case) | |
| 227 | na | na | ||||
| 228 | Ħ | U+0126 | Ħ | Maltese H (upper case) | ||
| 229 | na | na | ||||
| 230 | IJ | U+0132 | IJ | Dutch ligature (upper case) | ||
| 231 | na | na | ||||
| 232 | àL/ | Å | U+0141 | Ł | Polish l (upper case) | |
| 233 | àO/ | Ø | U+00D8 | Ø | Slash O (upper case) | |
| 234 | àOE | Œ | U+0152 | Œ | Ligature OE (upper case) | |
| 235 | na | na | ||||
| 236 | àTH | Þ | U+00DE | Þ | Icelandic Thorn (upper case) | |
| 237 | na | na | ||||
| 238 | na | na | ||||
| 239 | na | na | ||||
| 240 | na | na | ||||
| 241 | àae | æ | U+00E6 | æ | Ligature ae (lower case) | |
| 242 | àd/ | Ä' | U+0111 | đ | Serbo-Croatian d (lower case) | |
| 243 | àth | ð | U+00F0 | ð | Icelandic eth (lower case) | |
| 244 | ħ | U+0127 | ħ | Maltese h (lower case) | ||
| 245 | ài | ı | U+0131 | ı | Turkish i (lower case) | |
| 246 | ij | U+0133 | ij | Dutch ligature (lower case) | ||
| 247 | na | na | ||||
| 248 | àl/ | Å' | U+0142 | ł | Polish l (lower case) | |
| 249 | ào/ | ø | U+00F8 | ø | Slash o (lower case) | |
| 250 | àoe | œ | U+0153 | œ | Ligature oe (lower case) | |
| 251 | ß | U+00DF | ß | German double s (lower case) | ||
| 252 | àth | þ | U+00FE | þ | Icelandic thorn (lower case) |