Special Characters in HTML

"	quot	“	ldquo	”	rdquo	&	amp
	ensp		emsp		thinsp	·	middot
‘	lsquo	’	rsquo	‹	lsaquo	›	rsaquo
–	ndash	—	mdash	′	prime	″	Prime
«	laquo	»	raquo	±	plusmn
←	larr	→	rarr	↑	uarr	↓	darr
@	copy	˜	tilde	…	hellip	…	133
†	dagger	‡	Dagger	•	149	µ	micro
¼	frac14	½	frac12	¾	frac34
∑	sum	∏	prod	∗	lowast	√	radic
∧	and	∨	or	¬	not
≠	ne	÷	divide	≤	le	≥	ge
⊂	sub	⊆	sube	⊃	sup	⊇	supe
∈	isin	∉	notin	∋	ni	∞	infin
∼	sim	≡	equiv	≅	cong	≈	asymp

Note that each Html entity is preceded by '&' and followed by a semi-colon. For example: ≤ or ©

A few common uses of special characters:

Use space–space except when in a numerical range 7–10
Use smart quotes
Use prime/Prime for 5'7"

Useful references for practical typography: Mind your en and em dashes (from Smashing Magazine) and 5 simple ways to improve your typography.