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
⅓⅓
⅔⅔
⅕⅕
⅖⅖
⅗⅗
⅘⅘
⅙⅙
⅚⅚
⅛⅛
⅜⅜
⅝⅝
⅞⅞
¹¹
²²
³³
¶
§§
°°
 (space)
 (thin space)
 (hair space)
​(zero-width space)
⋯ ⋯
⋰⋰
⋱⋱
··
… &#x2026…
“ ““
” ””
‘ ‘‘
’ ’’
ℂℂ
ℕℕ
ℙℙ
ℚℚ
ℝℝ
ℤℤ
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; ∋
&#X2107ℇ   
&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;ℑ
&real;ℜ
&alefsym;ℵ
&#8453;℅
&#8456;℈
&#8459;ℋ
&#8460;ℌ
&#8464;ℐ
&#8466;ℒ
&#8472;℘
&#8473;ℙ
&#8474;ℚ
&#8475;ℛ
&#8488;ℨ
&#8492;ℬ
&#8493;ℭ
&#8496;ℰ
&#8497;ℱ
&#8499;ℳ

Letterlike Symbols (from Wikipedia)

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Last modified 14th January 2021