1, geometric symbol

⊥ ∥ ∠ ⌒ ⊙ ≡ ≌ △

2. Algebraic symbols

∝ ∧ ∨ ~ ∫ ≠ ≤ ≥ ≈ ∞ ∶

3. Operation symbols

× ÷ √

4. Symbol set

∪ ∩ ∈

5. Special symbols

∑π(π)

6. Inference symbols

| a |⊥∽△∞∩∩≦≦≤∈ⅲ

↑ → ↓ ↖ ↗ ↘ ↙ ∥ ∧ ∨

& amp

① ② ③ ④ ⑤ ⑥ ⑦ ⑧ ⑨ ⑩

Γ Δ Θ Λ Ξ Ο Π Σ Φ Χ Ψ Ω

α β γ δ ε ζ η θ ι κ λ μ ν

ξ ο π ρ σ τ υ φ χ ψ ω

Ⅰ Ⅱ Ⅲ Ⅳ Ⅴ Ⅵ Ⅶ Ⅷ Ⅸ Ⅹ Ⅺ Ⅻ

ⅰ ⅱ ⅲ ⅳ ⅴ ⅵ ⅶ ⅷ ⅸ ⅹ

∈ ∏ ∑ ∕ √ ∝ ∞ ∟ ∠ ∣ ∥ ∧ ∨ ∩ ∪ ∫ ∮

∴ ∵ ∶ ∷ ∽ ≈ ≌ ≒ ≠ ≡ ≤ ≥ ≦ ≧ ≮ ≯ ⊕ ⊙ ⊥

⊿ ⌒ ℃

Index 0 123:

symbolic meaning

∞ infinity

Pippi

The absolute value of the |x| function

Set up and merge

Set intersection

≥ greater than or equal to

≤ less than or equal to

≡ Constant is equal to or congruent with.

Ln(x) logarithm based on e

Lg(x) logarithm based on 10

Integer function on floor (x)

Integer function under ceil(x)

X mod y of remainder