Mass Deface @ \ § © ª ® ° ± ² ³ µ ¶ · ¹ º ¼ ½ ¾ × ÷ ‰ ™ Ω K Å ← ↑ → ↓ and of course � (U+fffd) for invalid-unicode or no-glyph There are also some graphics characters, but I doubt anyone uses those now.