Some HTML mathematics characters

Selections from http://www.w3.org/TR/REC-MathML/chap6/bycodes.html

Also see Math Characters / Symbols in HTML (Harel Barzilai)

½½
¼¼
¾¾
⅓
⅔
⅕
⅖
⅗
⅘
⅙
⅚
⅛
⅜
⅝
⅞
¹¹
²²
³³
¶
§§
°°
 (space)
​(zero-width space)
⋯
⋰
⋱
··
… &#x2026
“ “
” ”
‘ ‘
’ ’
ℂ
ℕ
ℙ
ℚ
ℝ
ℤ
α α    
β β    
γ γ Γ Γ
δ δ Δ Δ
εε    
η η    
ζ ζ    
θ θ Θ Θ
κ κ    
λ λ ΛΛ
μ μ    
ν ν    
ξ ξ Ξ Ξ
ω ω Ω Ω
π π Π Π
ρ ρ    
σ σ Σ Σ
τ τ    
ϑ ϑ    
υ υ ϒ ϒ
φ φ Φ Φ
χ χ Χ Χ
ψ ψ Ψ Ψ
ϖ ϖ    
⌊⌋
⌈⌉
⟨⟩
†‡
•⁃
–  – —
← →
↓ ↑
⇐ ⇒
⇑ ⇓
↔ ⇔
⇖⇗
⇙⇘
↖↗
↙↘
↜↝
↤↦
↫↬
↩↪
↢↣
↶↷
↺↻
↼↽
↾↿
⇀⇁
⇝⇒
∩ ∪
∧ ∨
⊗⊕
××× ×
⊙⊖
⊂ ⊃
⊆ ⊇
⊄ ⊅
⊈ ⊉
&lt; < &gt; >
&le; &ge;
&isin; &ni;
&#X2107   
&notin; &#8810;
&ne; &#8811;
&#8826; &#8827;
&#8828; &#8829;
&equiv; &#8802;
&cong; &#8774
&#8776; &#8777;
&sim; &#8769;
- - &#8768;
&#8765; &#8883;
&#8882; &#8883;
&#8884; &#8885;
&#8922; &#8923;
&forall; &exist;
&empty; &infin;
&oslash; ø &divide; ÷
&not; ¬    
&plusmn; ± &#8723;
&nabla; &part;
&perp; &ang;
&#8866; &#8867;
&radic; &prop;
&there4; &#8757;
&int; &#8751;
&#8748; &#8749;
&#8753; &#8754;
&#42; * &#8741;
&image;
&real;
&alefsym;
&#8453;
&#8456;
&#8459;
&#8460;
&#8464;
&#8466;
&#8472;
&#8473;
&#8474;
&#8475;
&#8488;
&#8492;
&#8493;
&#8496;
&#8497;
&#8499;

Letterlike Symbols (from Wikipedia)

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Last modified 17th March 2017