⋅ × ÷ ± ∓ ≒ ≠ ≦ ≧ ⋐ ⋑ ⊆ ⊇ ∈ ∋ ∪ ∩ ← → ⇐ ⇒ ⇔ ○ ⋯ ≡ ∽ ⊥ ⫽ ⫽⃥ α β δ ϵ γ ω φ ϕ θ Δ π ∞ ▵ ∠ ‾ ∑ ∫