This is a list of the different character entities commonly used in web development. I’ve found it to be a great resource. The blacked out rows are unused entities and listed for reference only.

chardescriptionnumerichexhtml
 null�%00 
 start of header%01 
 start of text%02 
 end of text%03 
 end of transmission%04 
 enquiry%05 
 acknowledgement%06 
 bell%07 
 backspace%08 
 horizontal tab	%09 
 linefeed
%0A 
 vertical tab%0B 
 form feed%0C 
 carriage return
%0D 
 shift out%0E 
 shift in%0F 
 data link escape%10 
 xon – device control 1%11 
 device control 2%12 
 xoff – device control 3%13 
 device control 4%14 
 negative acknowledgement%15 
 synchronous idle%16 
 end of transmission block%17 
 cancel%18 
 end of medium%19 
 substitute%1A 
 escape%1B 
 file separator%1C 
 group separator%1D 
 record separator%1E 
 unit separator%1F 
 space %20 
!exclamation mark!%21 
double quotation mark"%22"
#pound#%23 
$dollar$%24 
%percent%%25 
&ampersand&%26&
single quotation mark'%27 
(left parenthesis(%28 
)right parenthesis)%29 
*asterisk*%2A 
+plus+%2B 
,comma,%2C 
hyphen-%2D 
.period.%2E 
/forward slash/%2F 
00%30 
11%31 
22%32 
33%33 
44%34 
55%35 
66%36 
77%37 
88%38 
99%39 
:colon:%3A 
;semi-colon&#59;%3B 
<less-than symbol&#60;%3C&lt;
=equal&#61;%3D 
>greater-than symbol&#62;%3E&gt;
?question mark&#63;%3F 
@at symbol&#64;%40 
A&#65;%41 
B&#66;%42 
C&#67;%43 
D&#68;%44 
E&#69;%45 
F&#70;%46 
G&#71;%47 
H&#72;%48 
I&#73;%49 
J&#74;%4A 
K&#75;%4B 
L&#76;%4C 
M&#77;%4D 
N&#78;%4E 
O&#79;%4F 
P&#80;%50 
Q&#81;%51 
R&#82;%52 
S&#83;%53 
T&#84;%54 
U&#85;%55 
V&#86;%56 
W&#87;%57 
X&#88;%58 
Y&#89;%59 
Z&#90;%5A 
[left square bracket&#91;%5B 
back slash&#92;%5C 
]right square bracket&#93;%5D 
^circumflex&#94;%5E 
_underscore&#95;%5F 
`back-tick&#96;%60 
a&#97;%61 
b&#98;%62 
c&#99;%63 
d&#100;%64 
e&#101;%65 
f&#102;%66 
g&#103;%67 
h&#104;%68 
i&#105;%69 
j&#106;%6A 
k&#107;%6B 
l&#108;%6C 
m&#109;%6D 
n&#110;%6E 
o&#111;%6F 
p&#112;%70 
q&#113;%71 
r&#114;%72 
s&#115;%73 
t&#116;%74 
u&#117;%75 
v&#118;%76 
w&#119;%77 
x&#120;%78 
y&#121;%79 
z&#122;%7A 
{left curly brace&#123;%7B 
|vertical pipe&#124;%7C 
}right curly brace&#125;%7D 
~tilde&#126;%7E 
 delete&#127;%7F 
euro&#128;%80 
&#129;%81 
baseline single quote&#130;%82 
ƒflorin&#131;%83 
baseline double quote&#132;%84 
ellipsis&#133;%85 
single dagger&#134;%86 
double dagger&#135;%87 
ˆcircumflex&#136;%88 
per mil&#137;%89 
Šlatin capital letter S with caron&#138;%8A 
left single guillemet&#139;%8B 
Œlatin capital letter OE&#140;%8C 
&#141;%8D 
Žlatin capital letter Z with caron&#142;%8E 
&#143;%8F 
&#144;%90 
open single quote&#145;%91 
close single quote&#146;%92 
open double quote&#147;%93 
close double quote&#148;%94 
bullet&#149;%95 
en dash&#150;%96 
em dash&#151;%97 
˜tilde&#152;%98 
unregistered trademark&#153;%99 
šlatin small letter s with caron&#154;%9A 
right single guillemet&#155;%9B 
œlatin small letter oe&#156;%9C 
&#157;%9D 
žlatin small letter z with caron&#158;%9E 
Ÿlatin capital letter Y with diaeresis&#159;%9F 
non-breaking space&#160;%A0&nbsp;
¡inverted exclamation mark&#161;%A1&iexcl;
¢cents&#162;%A2&cent;
£pounds&#163;%A3&pound;
¤currency&#164;%A4&curren;
¥yen&#165;%A5&yen;
¦broken vertical bar&#166;%A6&brvbar;
§section symbol&#167;%A7&sect;
¨spacing diaeresis&#168;%A8&uml;
©copyright&#169;%A9&copy;
ªfeminine ordinal indicator&#170;%AA&ordf;
«left pointing guillemet&#171;%AB&laquo;
¬not&#172;%AC&not;
­soft hyphen&#173;%AD&shy;
®registered trademark&#174;%AE&reg;
¯spacing macron – overline&#175;%AF&macr;
°degree&#176;%B0&deg;
±plus-minus&#177;%B1&plusmn;
²superscript two&#178;%B2&sup2;
³superscript three&#179;%B3&sup3;
´acute&#180;%B4&acute;
µmicro&#181;%B5&micro;
paragraph&#182;%B6&para;
·middle dot&#183;%B7&middot;
¸cedilla&#184;%B8&cedil;
¹superscript one&#185;%B9&sup1;
ºmasculine ordinal indicator&#186;%BA&ordm;
»right pointing guillemet&#187;%BB&raquo;
¼fraction one quarter&#188;%BC&frac14;
½fraction one half&#189;%BD&frac12;
¾fraction three quarter&#190;%BE&frac34;
¿inverted question mark&#191;%BF&iquest;
Àlatin capital letter A with grave&#192;%C0&Agrave;
Álatin capital letter A with acute&#193;%C1&Aacute;
Âlatin capital letter A with circumflex&#194;%C2&Acirc;
Ãlatin capital letter A with tilde&#195;%C3&Atilde;
Älatin capital letter A with diaeresis&#196;%C4&Auml;
Ålatin capital letter A with ring above&#197;%C5&Aring;
Ælatin capital letter AE&#198;%C6&AElig;
Çlatin capital letter C with cedilla&#199;%C7&Ccedil;
Èlatin capital letter E with grave&#200;%C8&Egrave;
Élatin capital letter E with acute&#201;%C9&Eacute;
Êlatin capital letter E with circumflex&#202;%CA&Ecirc;
Ëlatin capital letter E with diaeresis&#203;%CB&Euml;
Ìlatin capital letter I with grave&#204;%CC&Igrave;
Ílatin capital letter I with acute&#205;%CD&Iacute;
Îlatin capital letter I with circumflex&#206;%CE&Icirc;
Ïlatin capital letter I with diaeresis&#207;%CF&Iuml;
Ðlatin capital letter ETH&#208;%D0&ETH;
Ñlatin capital letter N with tilde&#209;%D1&Ntilde;
Òlatin capital letter O with grave&#210;%D2&Ograve;
Ólatin capital letter O with acute&#211;%D3&Oacute;
Ôlatin capital letter O with circumflex&#212;%D4&Ocirc;
Õlatin capital letter O with tilde&#213;%D5&Otilde;
Ölatin capital letter O with diaeresis&#214;%D6&Ouml;
×multiplication&#215;%D7&times;
Ølatin capital letter O with stroke&#216;%D8&Oslash;
Ùlatin capital letter U with grave&#217;%D9&Ugrave;
Úlatin capital letter U with acute&#218;%DA&Uacute;
Ûlatin capital letter U with circumflex&#219;%DB&Ucirc;
Ülatin capital letter U with diaeresis&#220;%DC&Uuml;
Ýlatin capital letter Y with actue&#221;%DD&Yacute;
Þlatin capital letter THORN&#222;%DE&THORN;
ßlatin small letter sharp s&#223;%DF&szlig;
àlatin small letter a with grave&#224;%E0&agrave;
álatin small letter a with acute&#225;%E1&aacute;
âlatin small letter a with circumflex&#226;%E2&acirc;
ãlatin small letter a with tilde&#227;%E3&atilde;
älatin small letter a with diaeresis&#228;%E4&auml;
ålatin small letter a with ring above&#229;%E5&aring;
ælatin small letter ae&#230;%E6&aelig;
çlatin small letter c with cedilla&#231;%E7&ccedil;
èlatin small letter e with grave&#232;%E8&egrave;
élatin small letter e with acute&#233;%E9&eacute;
êlatin small letter e with circumflex&#234;%EA&ecirc;
ëlatin small letter e with diaeresis&#235;%EB&euml;
ìlatin small letter i with grave&#236;%EC&igrave;
ílatin small letter i with acute&#237;%ED&iacute;
îlatin small letter i with circumflex&#238;%EE&icirc;
ïlatin small letter i with diaeresis&#239;%EF&iuml;
ðlatin small letter eth&#240;%F0&eth;
ñlatin small letter n with tilde&#241;%F1&ntilde;
òlatin small letter o with grave&#242;%F2&ograve;
ólatin small letter o with acute&#243;%F3&oacute;
ôlatin small letter o with circumflex&#244;%F4&ocirc;
õlatin small letter o with tilde&#245;%F5&otilde;
ölatin small letter o with diaeresis&#246;%F6&ouml;
÷division&#247;%F7&divide;
ølatin small letter o with stroke&#248;%F8&oslash;
ùlatin small letter u with grave&#249;%F9&ugrave;
úlatin small letter u with acute&#250;%FA&uacute;
ûlatin small letter u with circumflex&#251;%FB&ucirc;
ülatin small letter u with diaeresis&#252;%FC&uuml;
ýlatin small letter y with acute&#253;%FD&yacute;
þlatin small letter thorn&#254;%FE&thorn;
ÿlatin small letter y with diaeresis&#255;%FF&yuml;
Œlatin capital letter OE&#338;%152&OElig;
œlatin small letter oe&#339;%153&oelig;
Šlatin capital letter S with caron&#352;%160&Scaron;
šlatin small letter s with caron&#353;%161&scaron;
Ÿlatin capital letter Y with diaeresis&#376;%178&Yuml;
ƒlatin small f with hook = function = florin&#402;%0192&fnof;
ˆcircumflex symbol&#710;%2C6&circ;
˜small tilde&#732;%2DC&tilde;
Αgreek capital letter alpha&#913;%0391&Alpha;
Βgreek capital letter beta&#914;%0392&Beta;
Γgreek capital letter gamma&#915;%0393&Gamma;
Δgreek capital letter delta&#916;%0394&Delta;
Εgreek capital letter epsilon&#917;%0395&Epsilon;
Ζgreek capital letter zeta&#918;%0396&Zeta;
Ηgreek capital letter eta&#919;%0397&Eta;
Θgreek capital letter theta&#920;%0398&Theta;
Ιgreek capital letter iota&#921;%0399&Iota;
Κgreek capital letter kappa&#922;%039A&Kappa;
Λgreek capital letter lambda&#923;%039B&Lambda;
Μgreek capital letter mu&#924;%039C&Mu;
Νgreek capital letter nu&#925;%039D&Nu;
Ξgreek capital letter xi&#926;%039E&Xi;
Οgreek capital letter omicron&#927;%039F&Omicron;
Πgreek capital letter pi&#928;%03A0&Pi;
Ρgreek capital letter rho&#929;%03A1&Rho;
Σgreek capital letter sigma&#931;%03A3&Sigma;
Τgreek capital letter tau&#932;%03A4&Tau;
Υgreek capital letter upsilon&#933;%03A5&Upsilon;
Φgreek capital letter phi&#934;%03A6&Phi;
Χgreek capital letter chi&#935;%03A7&Chi;
Ψgreek capital letter psi&#936;%03A8&Psi;
Ωgreek capital letter omega&#937;%03A9&Omega;
αgreek small letter alpha&#945;%03B1&alpha;
βgreek small letter beta&#946;%03B2&beta;
γgreek small letter gamma&#947;%03B3&gamma;
δgreek small letter delta&#948;%03B4&delta;
εgreek small letter epsilon&#949;%03B5&epsilon;
ζgreek small letter zeta&#950;%03B6&zeta;
ηgreek small letter eta&#951;%03B7&eta;
θgreek small letter theta&#952;%03B8&theta;
ιgreek small letter iota&#953;%03B9&iota;
κgreek small letter kappa&#954;%03BA&kappa;
λgreek small letter lambda&#955;%03BB&lambda;
μgreek small letter mu&#956;%03BC&mu;
νgreek small letter nu&#957;%03BD&nu;
ξgreek small letter xi&#958;%03BE&xi;
οgreek small letter omicron&#959;%03BF&omicron;
πgreek small letter pi&#960;%03C0&pi;
ρgreek small letter rho&#961;%03C1&rho;
ςgreek small letter final sigma&#962;%03C2&sigmaf;
σgreek small letter sigma&#963;%03C3&sigma;
τgreek small letter tau&#964;%03C4&tau;
υgreek small letter upsilon&#965;%03C5&upsilon;
φgreek small letter phi&#966;%03C6&phi;
χgreek small letter chi&#967;%03C7&chi;
ψgreek small letter psi&#968;%03C8&psi;
ωgreek small letter omega&#969;%03C9&omega;
ϑgreek small letter theta symbol&#977;%03D1&thetasym;
ϒgreek upsilon with hook symbol&#978;%03D2&upsih;
ϖgreek pi symbol&#982;%03D6&piv;
en space&#8194;%2002&ensp;
em space&#8195;%2003&emsp;
thin space&#8201;%2009&thinsp;
zero width non-joiner&#8204;%200C&zwnj;
zero width joiner&#8205;%200D&zwj;
left-to-right mark&#8206;%200E&lrm;
right-to-left mark&#8207;%200F&rlm;
en dash&#8211;%2013&ndash;
em dash&#8212;%2014&mdash;
left single quotation mark&#8216;%2018&lsquo;
right single quotation mark&#8217;%2019&rsquo;
single low-9 quotation mark&#8218;%201A&sbquo;
left double quotation mark&#8220;%201C&ldquo;
right double quotation mark&#8221;%201D&rdquo;
double low-9 quotation mark&#8222;%201E&bdquo;
single dagger&#8224;%2020&dagger;
double dagger&#8225;%2021&Dagger;
bullet = black small circle&#8226;%2022&bull;
horizontal ellipsis = three dot leader&#8230;%2026&hellip;
per mil&#8240;%2030&permil;
prime = minutes = feet&#8242;%2032&prime;
double prime = seconds = inches&#8243;%2033&Prime;
single left-pointing angle quotation mark&#8249;%2039&lsaquo;
single right-pointing angle quotation mark&#8250;%203A&rsaquo;
overline = spacing overscore&#8254;%203E&oline;
fraction slash&#8260;%2044&frasl;
euro&#8364;%20AC&euro;
script capital P = power set = Weierstrass p&#8472;%2118&weierp;
blackletter capital I = imaginary part&#8465;%2111&image;
blackletter capital R = real part symbol&#8476;%211C&real;
service mark sign&#8480;%2120&trade;
trade mark sign&#8482;%2122&trade;
alef symbol = first transfinite cardinal&#8501;%2135&alefsym;
leftwards arrow&#8592;%2190&larr;
upwards arrow&#8593;%2191&uarr;
rightwards arrow&#8594;%2192&rarr;
downwards arrow&#8595;%2193&darr;
left right arrow&#8596;%2194&harr;
downwards arrow with corner leftwards = carriage return&#8629;%21B5&crarr;
leftwards double arrow&#8656;%21D0&lArr;
upwards double arrow&#8657;%21D1&uArr;
rightwards double arrow&#8658;%21D2&rArr;
downwards double arrow&#8659;%21D3&dArr;
left right double arrow&#8660;%21D4&hArr;
for all&#8704;%2200&forall;
partial differential&#8706;%2202&part;
there exists&#8707;%2203&exist;
empty set = null set = diameter&#8709;%2205&empty;
nabla = backward difference&#8711;%2207&nabla;
element of&#8712;%2208&isin;
not an element of&#8713;%2209&notin;
contains as member&#8715;%220B&ni;
n-ary product = product sign&#8719;%220F&prod;
n-ary sumation&#8721;%2211&sum;
minus sign&#8722;%2212&minus;
asterisk operator&#8727;%2217&lowast;
square root = radical sign&#8730;%221A&radic;
proportional to&#8733;%221D&prop;
infinity&#8734;%221E&infin;
angle&#8736;%2220&ang;
logical and = wedge&#8743;%2227&and;
logical or = vee&#8744;%2228&or;
intersection = cap&#8745;%2229&cap;
union = cup&#8746;%222A&cup;
integral&#8747;%222B&int;
therefore&#8756;%2234&there4;
tilde operator = varies with = similar to&#8764;%223C&sim;
approximately equal to&#8773;%2245&cong;
almost equal to = asymptotic to&#8776;%2248&asymp;
not equal to&#8800;%2260&ne;
identical to&#8801;%2261&equiv;
less-than or equal to&#8804;%2264&le;
greater-than or equal to&#8805;%2265&ge;
subset of&#8834;%2282&sub;
superset of&#8835;%2283&sup;
not a subset of&#8836;%2284&nsub;
subset of or equal to&#8838;%2286&sube;
superset of or equal to&#8839;%2287&supe;
circled plus = direct sum&#8853;%2295&oplus;
circled times = vector product&#8855;%2297&otimes;
up tack = orthogonal to = perpendicular&#8869;%22A5&perp;
dot operator&#8901;%22C5&sdot;
left ceiling = apl upstile&#8968;%2308&lceil;
right ceiling&#8969;%2309&rceil;
left floor = apl downstile&#8970;%230A&lfloor;
right floor&#8971;%230B&rfloor;
left-pointing angle bracket = bra&#9001;%2329&lang;
right-pointing angle bracket = ket&#9002;%232A&rang;
lozenge&#9674;%25CA&loz;
spade suit&#9824;%2660&spades;
club suit&#9827;%2663&clubs;
heart suit&#9829;%2665&hearts;
diamond suit&#9830;%2666&diams;