Nice math symbols:
(Thanks to CutTheKnotMath)
ℙ ℕ ℤ ℚ ℝ ℂ ℍ•
∞±≍≠≤≥≅≡×∓∤
∝√⌊⌋⌈⌉πΔΣ∫∇∂⊥Γ
αβγδεηθλμρστφω
⊆⊇∅⋃⋂⊗℘ℱ∈∉
∴←→↔∧v¬⇐ ⇒↦
⁰¹²³⁴⁵⁶⁷⁸⁹⁺⁻ⁿ°₀₁₂₃₄₅₆₇₈₉ˣ
·•●♥♪
ςερτυθιοπασδγηξκλ«ζψωβνμ
ΣΕΡΤΥΘΙΟΠΑΣΔΦΓΗΞΚΛ»ΖΧΨΩΒΝΜ
✔ℵ
◄◄◄►►► ◄◄◄►►►♭♥♫ ♪ ☺ ∃
Mathematical Operators
∀∁∂∃∄∅∆∇∈∉∊∋∌∍∎∏∐∑−∓∔∕∖∗∘∙√∛∜∝∞
∟∠∡∢∣∤∥∦∧∨∩∪∫∬∭∮∯∰∱∲∳∴∵∶∷∸∹∺∻
∼∽∾∿≀≁≂≃≄≅≆≇≍≉≊≋
≌≍≎≏≐≑≒≓≔≕≖≗≘≙≚≛≜≝≞≟≠≡≢≣≤≥
≦≧≨≩≪≫≬≭≮≯≰≱≲≳≴≵≶≷≸≹≺≻≼≽≾≿⊀⊁⊂⊃⊄⊅⊆⊇
⊈⊉⊊⊋⊌⊍⊎⊏⊐⊑⊒...