•        •  (bullet)
←   ← (left-pointing arrow)
→   → (right-pointing arrow)
↕   ↕ (double-headed up/down arrow)
↔   ↔ (double-headed left/right arrow)
①   ① (circled '1')
②   ② (circled '2')
⋁   ⋁ (or)
⋀   ⋀ (and)
⊕   ⊕ (xor)
   (⊻ ('⊻') is now the standard symbol for XOR but Zilog used ⊕)
∼   ∼ (tilde operator)
¬     ¬ (logical not)
≠   ≠ (not equal)
≡   ≡ (identical to)
A picture of the characters in case your browser doesn't display
them correctly:
![[A screenshot of the special characters as displayed by Firefox]](z80chars.gif)