Super duper code chart for special characters

Char	Description	MS ALT Code	HTML	Char	Description	MS ALT Code	HTML
á	lowercase a with acute accent	ALT + 0225	á	Á	uppercase A with acute accent	ALT + 0193	Á
â	lowercase a with circumflex	ALT + 0226	â	Â	uppercase A with circumflex	ALT + 0194	Â
à	lowercase a with grave accent	ALT + 0224	à	À	uppercase A with grave accent	ALT + 0192	À
ā	lowercase a with macron	ALT + 0257	ā	Ā	uppercase A with macron	ALT + 0256	Ā
å	lowercase a with overring (also ångström)	ALT + 0229	å	Å	uppercase A with overring (also ångström)	ALT + 0197	Å
ã	lowercase a with tilde	ALT + 0227	ã	Ã	uppercase A with tilde	ALT + 0195	Ã
ä	lowercase a with umlaut/diaeresis/tréma	ALT + 0228	ä	Ä	uppercase A with umlaut/diaeresis/tréma	ALT + 0196	Ä
æ	lowercase ae ligature	ALT + 0230	æ	Æ	uppercase AE ligature	ALT + 0198	Æ
ç	lowercase c with cedilla	ALT + 0231	ç	Ç	uppercase C with cedilla	ALT + 0199	Ç
é	lowercase e with acute accent	ALT + 0233	é	É	uppercase E with acute accent	ALT + 0201	É
ê	lowercase e with circumflex	ALT + 0234	ê	Ê	uppercase E with circumflex	ALT + 0202	Ê
è	lowercase e with grave accent	ALT + 0232	è	È	uppercase E with grave accent	ALT + 0200	È
ē	lowercase e with macron	ALT + 0275	ē	Ē	uppercase E with macron	ALT + 0274	Ē
ë	lowercase e with umlaut/diaeresis/tréma	ALT + 0235	ë	Ë	uppercase E with umlaut/diaeresis/tréma	ALT + 0203	Ë
í	lowercase i with acute accent	ALT + 0237	í	Í	uppercase I with acute accent	ALT + 0205	Í
î	lowercase i with circumflex	ALT + 0238	î	Î	uppercase I with circumflex	ALT + 0206	Î
ì	lowercase i with grave accent	ALT + 0236	ì	Ì	uppercase I with grave accent	ALT + 0204	Ì
ī	lowercase i with macron	ALT + 0299	ī	Ī	uppercase I with macron	ALT + 0298	Ī
ï	lowercase i with umlaut/diaeresis/tréma	ALT + 0239	ï	Ï	uppercase I with umlaut/diaeresis/tréma	ALT + 0207	Ï
ñ	lowercase n with tilde	ALT + 0241	ñ	Ñ	uppercase N with tilde	ALT + 0209	Ñ
ó	lowercase o with acute accent	ALT + 0243	ó	Ó	uppercase O with acute accent	ALT + 0211	Ó
ô	lowercase o with circumflex	ALT + 0244	ô	Ô	uppercase O with circumflex	ALT + 0212	Ô
ő	lowercase o with double acute accent	ALT + 0337	ő	Ő	uppercase O with double acute accent	ALT + 0336	Ő
ò	lowercase o with grave accent	ALT + 0242	ò	Ò	uppercase O with grave accent	ALT + 0210	Ò
ō	lowercase o with macron	ALT + 0333	ō	Ō	uppercase O with macron	ALT + 0332	Ō
ø	lowercase o with slash	ALT + 0248	ø	Ø	uppercase O with slash	ALT + 0216	Ø
õ	lowercase o with tilde	ALT + 0245	õ	Õ	uppercase O with tilde	ALT + 0213	Õ
ö	lowercase o with umlaut/diaeresis/tréma	ALT + 0246	ö	Ö	uppercase O with umlaut/diaeresis/tréma	ALT + 0214	Ö
œ	lowercase oe ligature	ALT + 0156	&oelig;	Œ	uppercase OE ligature	ALT + 0140	&OElig;
ß	lowercase sharp s or “eszett”	ALT + 0223	ß	ẞ	uppercase sharp s or “eszett”	ALT + ?	&SZlig;
ú	lowercase u with acute accent	ALT + 0250	ú	Ú	uppercase U with acute accent	ALT + 0218	Ú
û	lowercase u with circumflex	ALT + 0251	û	Û	uppercase U with circumflex	ALT + 0219	Û
ű	lowercase u with double acute accent	ALT + 0369	ű	Ű	uppercase U with double acute accent	ALT + 0368	Ű
ù	lowercase u with grave accent	ALT + 0249	ù	Ù	uppercase U with grave accent	ALT + 0217	Ù
ū	lowercase u with macron	ALT + 0363	ū	Ū	uppercase U with macron	ALT + 0362	Ū
ü	lowercase u with umlaut/diaeresis/tréma	ALT + 0252	ü	Ü	uppercase U with umlaut/diaeresis/tréma	ALT + 0220	Ü
ý	lowercase y with acute accent	ALT + 0253	ý	Ý	uppercase Y with acute accent	ALT + 0221	Ý
ȳ	lowercase y with macron	ALT + 0563	ȳ	Ȳ	uppercase Y with macron	ALT + 0562	Ȳ
ÿ	lowercase y with umlaut/diaeresis/tréma	ALT + 0255	ÿ	Ÿ	uppercase Y with umlaut/diaeresis/tréma	ALT + 0159	&Yuml;
€	Euro (placed before number)	ALT + 0128	€	£	British pound (placed before number)	ALT + 0163	£
¢	cent (placed after number)	ALT + 0162	?	¥	Japanese yen (placed before number)	ALT + 0165	?
≈	approximately equal symbol	ALT + 247	≈	∞	infinity symbol or “lemniscate”	ALT + 236	∞

What are diacritical marks and accents?