List of codes of form &#n; where n varies from 0 to 255:

00 �        
10      
20          
30   ! " # $ % & '
40 ( ) * + , - . / 0 1
50 2 3 4 5 6 7 8 9 : ;
60 < = > ? @ A B C D E
70 F G H I J K L M N O
80 P Q R S T U V W X Y
90 Z [ \ ] ^ _ ` a b c
100 d e f g h i j k l m
110 n o p q r s t u v w
120 x y z { | } ~  € 
130 ‚ ƒ „ … † ‡ ˆ ‰ Š ‹
140 Œ  Ž   ‘ ’ “ ” •
150 – — ˜ ™ š › œ  ž Ÿ
160   ¡ ¢ £ ¤ ¥ ¦ § ¨ ©
170 ª « ¬ ­ ® ¯ ° ± ² ³
180 ´ µ ¶ · ¸ ¹ º » ¼ ½
190 ¾ ¿ À Á Â Ã Ä Å Æ Ç
200 È É Ê Ë Ì Í Î Ï Ð Ñ
210 Ò Ó Ô Õ Ö × Ø Ù Ú Û
220 Ü Ý Þ ß à á â ã ä å
230 æ ç è é ê ë ì í î ï
240 ð ñ ò ó ô õ ö ÷ ø ù
250 ú û ü ý þ ÿ

Special abbreviations for characters:

&amp; &
&deg; °
&times; ×
&sup1; ¹
&sup2; ²
&sup3; ³
&lt; <
&gt; >
&quot; "
&Aring; Å
&aring; å
&Aacute; Á
&aacute; á
&Auml; Ä
&auml; ä
&Agrave; À
&agrave; à
&Acirc; Â
&acirc; â
&ouml; ö
&pm; ±
&radic; √
&nbsp;   (blank space)
&#8463; ℏ

Greek characters:

&alpha; α
&beta; β
&chi; χ
&delta; δ
&epsilon; ε
&eta; η
&gamma; γ
&iota; ι
&kappa; κ
&lambda; λ
&micro; µ
&mu; μ
&nu; ν
&omega; ω
&pi; π
&phi; φ
&rho; ρ
&sigma; σ
&tau; τ
&theta; θ
&xi; ξ
&zeta; ζ

&Alpha; Α
&Beta; Β
&Chi; Χ
&Delta; Δ
&Epsilon; Ε
&Eta; Η
&Gamma; Γ
&Iota; Ι
&Kappa; Κ
&Lambda; Λ
&Mu; Μ
&Nu; Ν
&Omega; Ω
&Pi; Π
&Phi; Φ
&Rho; Ρ
&Sigma; Σ
&Tau; Τ
&Theta; Θ
&Xi; Ξ
&Zeta; Ζ

Modes:

Superscript: <sup> this is a test
Subscript: <sub> this is a test
Math: <math> ∫_a_^b^{f(x)1+x} dx this requires html 3.0!
Overline: <span style="text-decoration:overline;">1</span> 1