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Mathematical signs

Signs plus, minus, plus, minus, equal, not equal, approximately equal, multiplication, division, sum:
+ − ± ∓ = ≠ ≈ ≃ ÷ ∗ ∙ × ∑ ⩱ ⩲

Integrals:
∫ ∬ ∭ ∮ ∯ ∰ ∱ ∲ ∳ ⨌ ⨍ ⨎ ⨏ ⨐ ⨑ ⨒ ⨓ ⨔ ⨕ ⨖ ⨗ ⨘ ⨙ ⨚ ⨛ ⨜

Comparison - more, less than or equal:
< > ≤ ≥ ≪ ≫ ≮ ≯

Geometric - diameter, angle, degree, perpendicular, parallelism, diameter, proportionality, similarity, intersection, union:
⌀ ∠ ∡ ∢ ⦛ ⦜ ⦝ ⦞ ⦟ ⦠ ⦡ ⦢ ⦣ ° ⟂ ⏊ ⊥ ∥ ∦ |∙ ~ ∝ ⋂ ⋃

Degrees and roots:
99 ^ ⁰ ¹ ² ³ ⁴ ⁵ ⁶ ⁷ ⁸ ⁹ ⁺ ⁻ ⁼ ⁽ ⁾ √ ∛ ∜

Figures - triangles, arcs, parallelogram, rhombus:
⌒ ◠ ◡ ⊿ △ ▷ ▽ ◁ □ ▭ ▱ ○ ◊

Logical - therefore, and, or, negations, identical:
⇒ ⇔ ⇐ ⇍ ⇏ → ∧ ∨ ⋀ ⋁ ∴ ¬ ≡

More signs - exists, empty set, belongs, subset, infinity:
∃ ∀ ∅ ∈ ∉ ⊆ ∞