Voici une petite liste de signes :

Alt + 0223 = ß
Alt + 2 ☻ (un smiley)
Alt + 3 = ♥ (coeur au fond rempli)
Alt + 5 = ♣
Alt + 6 = ♠
Alt + 7 = •
Alt + 9 = ○
Alt + 10 = ◙
Alt + 11 = ♂
Alt + 12 = ♀
Alt + 13 = ♪
Alt + 15 =☼ (soleil)
Alt + 14 =♫ (note de musique double)
Alt + 18 = ↕
Alt + 19 = ‼
Alt + 20 = ¶
Alt + 21 = §
Alt + 24 = ↑
Alt + 25 = ↓
Alt + 26 = →
Alt + 27 = ←
Alt + 28 = ∟
Alt + 29 = ↔
Alt + 30 = ▲
Alt + 31 = ▼
alt + 145 = æ
Alt + 157= Ø
Alt + 155= ø
Alt + 168 = ¿
Alt + 169 = ®
Alt + 170 = ¬
Alt + 174 = «
Alt + 175 = »
Alt + 177 = ▒
Alt + 178 = ▓
Alt + 180 = ┤
Alt + 184 = ©
Alt + 185 = ╣
Alt + 186 = ║
Alt + 187 = ╗
Alt + 188 = ╝
Alt + 189 = ¢
Alt + 190 = ¥
Alt + 191 = ┐
Alt + 192 = └
Alt + 193 = ┴
Alt + 194 = ┬
Alt + 195 = ├
Alt + 196 = ─
Alt + 197 = ┼
Alt + 200 = ╚
Alt + 201 = ╔
Alt + 202 = ╩
Alt + 203 = ╦
Alt + 204 = ╠
Alt + 205 = ═
Alt + 206 = ╬
Alt + 208 = ð
Alt + 209 = Ð
Alt + 213 = ı
Alt + 217 = ┘
Alt + 218 = ┌
Alt + 219 = █
Alt + 220 = ▄
Alt + 225 = ß
Alt + 231 = þ
Alt + 232 = Þ
Alt + 238 = ¯
Alt + 241 = ±
Alt + 242 = ‗
Alt + 246 = ÷
Alt + 250 = · (différent du point normal .)
Alt + 251 = ¹ (exposant 1)
Alt + 252 = ³ (exposant 3)
Alt + 253 = ² (exposant 2)
Alt + 254 = ■
Alt + 433 ▒
Alt + 434 ▓
Alt + 499 = Ÿ
alt +754 = ‗
Alt + 785 = ◄
Alt + 925 = Ø
alt + 999 = þ
Alt + 3331 = ♥
alt + 12151214 = «
alt + 12151215 = »

Merci Black, c'est très utile ♥ (Depuis le temps que je cherchais ça !)