A lot of people wonder how to get an inverted question mark – which looks like this : ¿ using the English keyboard.
It is very simple. To get an inverted question mark, hold the Alt key down and type 0191.
If you are looking for complete list of keyboard shortcut for special characters, in Windows and in Mac, please visit this webpage. It has wealth load of information.
The website provides you details of HTML Name code, HTML Number Code, Glyph, MacOS key combination, Windows Key Combination and Description for all the special characters. I below quoted table is from the site mentioned above.
| HTML Name Code | HTML Number Code | Glyph | MacOS | Windows | Description |
| ‘ | ‘ | ‘ | option – ] | Alt + 0145 | left single quote |
| ’ | ’ | ’ | option – shift – ] | Alt + 0146 | right single quote |
| ‚ | ‚ | ‚ | single low-9 quote | ||
| “ | “ | “ | option – [ | Alt + 0147 | left double quote |
| ” | ” | ” | option – shift – [ | Alt + 0148 | right double quote |
| „ | „ | „ | option – shift – w | double low-9 quote | |
| † | † | † | option – t | Alt + 0134 | dagger |
| ‡ | ‡ | ‡ | option – shift – 7 | Alt + 0135 | double dagger |
| … | … | option – ; | horizontal ellipsis | ||
| ‰ | ‰ | ‰ | option – shift – r | Alt + 0137 | per mill sign |
| ‹ | ‹ | ‹ | option – shift – 3 | Alt + 0139 | single left-pointing angle quote |
| › | › | › | option – shift – 4 | Alt + 0155 | single right-pointing angle quote |
| ♠ | ♠ | ? | black spade suit | ||
| ♣ | ♣ | ? | black club suit | ||
| ♥ | ♥ | ? | black heart suit | ||
| ♦ | ♦ | ? | black diamond suit | ||
| ‾ | ‾ | ? | overline, = spacing overscore | ||
| ← | ← | ? | leftward arrow | ||
| ↑ | ↑ | ? | upward arrow | ||
| → | → | ? | rightward arrow | ||
| ↓ | ↓ | ? | downward arrow | ||
| ™ | ™ | ™ | option – 2 | Alt + 0153 | trademark sign |
| " | " | “ | double quotation mark | ||
| & | & | & | ampersand | ||
| < | < | < | less-than sign | ||
| > | > | > | greater-than sign | ||
| [ | [ | left square bracket | |||
| ] | ] | right square bracket | |||
| – | – | – | option – hyphen | Alt + 0150 | en dash |
| — | — | — | option – shift -hyphen | Alt + 0151 | em dash |
| |   | Alt + 0160 | nonbreaking space | ||
| ¡ | ¡ | ¡ | option – 1 | Alt + 0161 | inverted exclamation |
| ¢ | ¢ | ¢ | option – 4 | Alt + 0162 | cent sign |
| £ | £ | £ | option – 3 | Alt + 0163 | pound sterling |
| ¤ | ¤ | ¤ | Alt + 0164 | general currency sign | |
| ¥ | ¥ | ¥ | option – y | Alt + 0165 | yen sign |
| ¦ or &brkbar; | ¦ | ¦ | Alt + 0166 | broken vertical bar | |
| § | § | § | option – 6 | Alt + 0167 | section sign |
| ¨ or ¨ | ¨ | ¨ | option – shift – u | Alt + 0168 | umlaut |
| © | © | © | option – g | Alt + 0169 | copyright |
| ª | ª | ª | option – 9 | Alt + 0170 | feminine ordinal |
| « | « | « | option – \ | Alt + 0171 | left angle quote |
| ¬ | ¬ | ¬ | option – l | Alt + 0172 | not sign |
| ­ | ­ | | Alt + 0173 | soft hyphen | |
| ® | ® | ® | option – r | Alt + 0174 | registered trademark |
| ¯ or &hibar; | ¯ | ¯ | Alt + 0175 | macron accent | |
| ° | ° | ° | option – shift – 8 | Alt + 0176 | degree sign |
| ± | ± | ± | option – shift – = | Alt + 0177 | plus or minus |
| ² | ² | ² | Alt + 0178 | superscript two | |
| ³ | ³ | ³ | Alt + 0179 | superscript three | |
| ´ | ´ | ´ | option – shift – e | Alt + 0180 | acute accent |
| µ | µ | µ | option – m | Alt + 0181 | micro sign |
| ¶ | ¶ | ¶ | option – 7 | Alt + 0182 | paragraph sign |
| · | · | · | option – shift – 9 | Alt + 0183 | middle dot |
| ¸ | ¸ | ¸ | option – shift – z | Alt + 0184 | cedilla |
| ¹ | ¹ | ¹ | Alt + 0185 | superscript one | |
| º | º | º | option – 0 | Alt + 0186 | masculine ordinal |
| » | » | » | option – shift – \ | Alt + 0187 | right angle quote |
| ¼ | ¼ | ¼ | Alt + 0188 | one-fourth | |
| ½ | ½ | ½ | Alt + 0189 | one-half | |
| ¾ | ¾ | ¾ | Alt + 0190 | three-fourths | |
| ¿ | ¿ | ¿ | option – shift – ? | Alt + 0191 | inverted question mark |
| À | À | À | option – ` A | Alt + 0192 | uppercase A, grave accent |
| Á | Á | Á | option – e A | Alt + 0193 | uppercase A, acute accent |
| Â | Â | Â | option – i A | Alt + 0194 | uppercase A, circumflex accent |
| Ã | Ã | Ã | option – n A | Alt + 0195 | uppercase A, tilde |
| Ä | Ä | Ä | option – u A | Alt + 0196 | uppercase A, umlaut |
| Å | Å | Å | option – shift – a | Alt + 0197 | uppercase A, ring |
| Æ | Æ | Æ | option – shift – ‘ | Alt + 0198 | uppercase AE |
| Ç | Ç | Ç | option – shift – c | Alt + 0199 | uppercase C, cedilla |
| È | È | È | option – ` E | Alt + 0200 | uppercase E, grave accent |
| É | É | É | option – e E | Alt + 0201 | uppercase E, acute accent |
| Ê | Ê | Ê | option – i E | Alt + 0202 | uppercase E, circumflex accent |
| Ë | Ë | Ë | option – u E | Alt + 0203 | uppercase E, umlaut |
| Ì | Ì | Ì | option – ` I | Alt + 0204 | uppercase I, grave accent |
| Í | Í | Í | option – e I | Alt + 0205 | uppercase I, acute accent |
| Î | Î | Î | option – i I | Alt + 0206 | uppercase I, circumflex accent |
| Ï | Ï | Ï | option – u I | Alt + 0207 | uppercase I, umlaut |
| Ð | Ð | Ð | Alt + 0208 | uppercase Eth, Icelandic | |
| Ñ | Ñ | Ñ | option – n N | Alt + 0209 | uppercase N, tilde |
| Ò | Ò | Ò | option – ` O | Alt + 0210 | uppercase O, grave accent |
| Ó | Ó | Ó | option – e O | Alt + 0211 | uppercase O, acute accent |
| Ô | Ô | Ô | option – i O | Alt + 0212 | uppercase O, circumflex accent |
| Õ | Õ | Õ | option – n O | Alt + 0213 | uppercase O, tilde |
| Ö | Ö | Ö | option – u O | Alt + 0214 | uppercase O, umlaut |
| × | × | × | Alt + 0215 | multiplication sign | |
| Ø | Ø | Ø | option – shift – o | Alt + 0216 | uppercase O, slash |
| Ù | Ù | Ù | option – ` U | Alt + 0217 | uppercase U, grave accent |
| Ú | Ú | Ú | option – e U | Alt + 0218 | uppercase U, acute accent |
| Û | Û | Û | option – i U | Alt + 0219 | uppercase U, circumflex accent |
| Ü | Ü | Ü | option – u U | Alt + 0220 | uppercase U, umlaut |
| Ý | Ý | Ý | Alt + 0221 | uppercase Y, acute accent | |
| Þ | Þ | Þ | Alt + 0222 | uppercase THORN, Icelandic | |
| ß | ß | ß | option – s | Alt + 0223 | lowercase sharps, German |
| à | à | à | option – ` a | Alt + 0224 | lowercase a, grave accent |
| á | á | á | option – e a | Alt + 0225 | lowercase a, acute accent |
| â | â | â | option – i a | Alt + 0226 | lowercase a, circumflex accent |
| ã | ã | ã | option – n a | Alt + 0227 | lowercase a, tilde |
| ä | ä | ä | option – u a | Alt + 0228 | lowercase a, umlaut |
| å | å | å | option – a | Alt + 0229 | lowercase a, ring |
| æ | æ | æ | option – ‘ | Alt + 0230 | lowercase ae |
| ç | ç | ç | option – c | Alt + 0231 | lowercase c, cedilla |
| è | è | è | option – ` e | Alt + 0232 | lowercase e, grave accent |
| é | é | é | option – e e | Alt + 0233 | lowercase e, acute accent |
| ê | ê | ê | option – i e | Alt + 0234 | lowercase e, circumflex accent |
| ë | ë | ë | option – u e | Alt + 0235 | lowercase e, umlaut |
| ì | ì | ì | option – ` i | Alt + 0236 | lowercase i, grave accent |
| í | í | í | option – e i | Alt + 0237 | lowercase i, acute accent |
| î | î | î | option – i i | Alt + 0238 | lowercase i, circumflex accent |
| ï | ï | ï | option – u i | Alt + 0239 | lowercase i, umlaut |
| ð | ð | ð | Alt + 0240 | lowercase eth, Icelandic | |
| ñ | ñ | ñ | option – n n | Alt + 0241 | lowercase n, tilde |
| ò | ò | ò | option – ` o | Alt + 0242 | lowercase o, grave accent |
| ó | ó | ó | option – e o | Alt + 0243 | lowercase o, acute accent |
| ô | ô | ô | option – i o | Alt + 0244 | lowercase o, circumflex accent |
| õ | õ | õ | option – n o | Alt + 0245 | lowercase o, tilde |
| ö | ö | ö | option – u o | Alt + 0246 | lowercase o, umlaut |
| ÷ | ÷ | ÷ | Alt + 0247 | division sign | |
| ø | ø | ø | option – o | Alt + 0248 | lowercase o, slash |
| ù | ù | ù | option – ` u | Alt + 0249 | lowercase u, grave accent |
| ú | ú | ú | option – e u | Alt + 0250 | lowercase u, acute accent |
| û | û | û | option – i u | Alt + 0251 | lowercase u, circumflex accent |
| ü | ü | ü | option – u u | Alt + 0252 | lowercase u, umlaut |
| ý | ý | ý | Alt + 0253 | lowercase y, acute accent | |
| þ | þ | þ | Alt + 0254 | lowercase thorn, Icelandic | |
| ÿ | ÿ | ÿ | option – u y | Alt + 0255 | lowercase y, umlaut |