ALT sequences:  Hold down the Alt key, and type the four digits using the numeric keypad

  -- ALT 0160 (non-breaking space)

« -- ALT 0171 ? grouping
» -- ALT 0187 ? grouping
‹ -- ALT 0139 ? grouping
› -- ALT 0155 ? grouping

± -- ALT 0177 plus or minus
× -- ALT 0215 multiplied by
÷ -- ALT 0247 divided by
¼ -- ALT 0188 one fourth
½ -- ALT 0189 one hal
f¾ -- ALT 0190 three fourths
° -- ALT 0176 ? degrees, or superscript zero
º -- ALT 0186 ? superscript zero, or degrees
¹ -- ALT 0185 superscript 1
² -- ALT 0178 superscript 2
³ -- ALT 0179 superscript 3
ª -- ALT 0170 superscript a
‰ -- ALT 0137 ? per thousand
µ -- ALT 0181 Greek mu; micro as in µsecond

¡ -- ALT 0161 initial !
¿ -- ALT 0191 initial ?

¶ -- ALT 0182 paragraph
§ -- ALT 0167 section
© -- ALT 0169 copyright
® -- ALT 0174 registered trademark
™ -- ALT 0153 trade mark
– -- ALT 0150 ?
— -- ALT 0151 word-separating dash for use without surrounding spaces­
 -- ALT 0173 ? makes sort of a dash in Wordpad and Notepad
¯ -- ALT 0175 ?
¦ -- ALT 0166 ? the key with this on it produces |
„ -- ALT 0132 ? double comma
… -- ALT 0133 ellipsis
ˆ -- ALT 0136 circumflex; not the same as shift-6 which is ^
' -- ALT 0145 opening single quote
' -- ALT 0146 closing single quote
“ -- ALT 0147 opening double quote
” -- ALT 0148 closing double quote
˜ -- ALT 0152 tilde
´ -- ALT 0180 acute accent
¸ -- ALT 0184 cedilla

· -- ALT 0183 ?
• -- ALT 0149 ?
¤ -- ALT 0164 ?
¬ -- ALT 0172 ? 'not' in symbolic logic and PL/I
† -- ALT 0134 ? dagger or obelisk or obelus, used for footnotes
‡ -- ALT 0135 ? double dagger, sometimes dagger
¨ -- ALT 0168 dieresis or umlaut

¢ -- ALT 0162 cent symbol
€ -- ALT 0128 euro symbol
ƒ -- ALT 0131 ? franc (French? Belgian? any?)
£ -- ALT 0163 pound (currency)
¥ -- ALT 0165 Yen

þ -- ALT 0254 upper-case thorn (Icelandic for th sound)
Þ -- ALT 0222 lower-case thorn

À -- ALT 0192 Letters with various additions follow;
Á -- ALT 0193 diphthongs are alphabetized after the
 -- ALT 0194 initial letter
à -- ALT 0195
Ä -- ALT 0196
Å -- ALT 0197
à -- ALT 0224
á -- ALT 0225
â -- ALT 0226
ã -- ALT 0227
ä -- ALT 0228
å -- ALT 0229
Æ -- ALT 0198
æ -- ALT 0230
Ç -- ALT 0199
ç -- ALT 0231
Ð -- ALT 0208
ð -- ALT 0240
È -- ALT 0200
É -- ALT 0201
Ê -- ALT 0202
Ë -- ALT 0203
è -- ALT 0232
é -- ALT 0233
ê -- ALT 0234
ë -- ALT 0235
Ì -- ALT 0204
Í -- ALT 0205
Î -- ALT 0206
Ï -- ALT 0207
ì -- ALT 0236
í -- ALT 0237
î -- ALT 0238
ï -- ALT 0239
Ñ -- ALT 0209
ñ -- ALT 0241
Ò -- ALT 0210
Ó -- ALT 0211
Ô -- ALT 0212
Õ -- ALT 0213
Ö -- ALT 0214
ò -- ALT 0242
ó -- ALT 0243
ô -- ALT 0244
õ -- ALT 0245
ö -- ALT 0246
Ø -- ALT 0216
ø -- ALT 0248
Π-- ALT 0140
œ -- ALT 0156
Š -- ALT 0138
š -- ALT 0154
ß -- ALT 0223
Ù -- ALT 0217
Ú -- ALT 0218
Û -- ALT 0219
Ü -- ALT 0220
ù -- ALT 0249
ú -- ALT 0250
û -- ALT 0251
ü -- ALT 0252
Ý -- ALT 0221
Ÿ -- ALT 0159
ý -- ALT 0253
ÿ -- ALT 0255
Ž -- ALT 0142
ž -- ALT 0158 

HTML strings:

Notes (replace pound with #):
♪ &pound9834;
♫ &pound9834;

Card Suits:
♣ ♣
♦ ♦
♥ ♥
♠ ♠

Greek alphabet:
α α
Α Α
β β
Β Β
γ γ
Γ Γ
δ δ
Δ Δ
... etc ...
ω ω
Ω Ω

Miscellany:
ƒ ƒ (function of)
¢ ¢ (cent sign)
£ £ (pound sign)
¥ ¥ (yen sign)
§ § (section symbol)
¶ ¶ (paragraph symbol)
© © (copyright)
™ ™ (trademark)
® ® (registered trademark)
° ° (degree symbol)
µ µ (micro symbol)
¼ ¼
½ ½
¾ ¾
∞ ∞ (infinity)
∫ ∫ (integral)