http://htmlhelp.com/reference/html40/entities/special.html

The following table gives the character entity reference, decimal character reference, and hexadecimal character reference for markup-significant and internationalization characters, as well as the rendering of each in your browser. Glyphs of the characters are available at the Unicode Consortium. With the exception of HTML 2.0’s “, &, <, and >, these entities are all new in HTML 4.0 and may not be supported by old browsers. Support in recent browsers is good.

Character Entity Decimal Hex Rendering in Your Browser
Entity Decimal Hex
quotation mark = APL quote " " " " " "
ampersand & & & & & &
less-than sign < < < < < <
greater-than sign > > > > > >
Latin capital ligature OE Œ Œ Œ Œ Œ Œ
Latin small ligature oe œ œ œ œ œ œ
Latin capital letter S with caron Š Š Š Š Š Š
Latin small letter s with caron š š š š š š
Latin capital letter Y with diaeresis Ÿ Ÿ Ÿ Ÿ Ÿ Ÿ
modifier letter circumflex accent ˆ ˆ ˆ ˆ ˆ ˆ
small tilde ˜ ˜ ˜ ˜ ˜ ˜
en space
em space
thin space
zero width non-joiner ‌ ‌ ‌ ‌ ‌ ‌
zero width joiner ‍ ‍ ‍ ‍ ‍ ‍
left-to-right mark ‎ ‎ ‎ ‎ ‎ ‎
right-to-left mark ‏ ‏ ‏ ‏ ‏ ‏
en dash – – – – – –
em dash — — — — — —
left single quotation mark ‘ ‘ ‘ ‘ ‘ ‘
right single quotation mark ’ ’ ’ ’ ’ ’
single low-9 quotation mark ‚ ‚ ‚ ‚ ‚ ‚
left double quotation mark “ “ “ “ “ “
right double quotation mark ” ” ” ” ” ”
double low-9 quotation mark „ „ „ „ „ „
dagger † † † † † †
double dagger ‡ ‡ ‡ ‡ ‡ ‡
per mille sign ‰ ‰ ‰ ‰ ‰ ‰
single left-pointing angle quotation mark ‹ ‹ ‹ ‹ ‹ ‹
single right-pointing angle quotation mark › › › › › ›
euro sign € € € € € €