# HTML 4.01 符号实体 本字符实体参考手册包括了数学符号、希腊字符、各种箭头记号、科技符号以及形状。 注释:实体名称对大小写敏感。 ## HTML 支持的数学符号 | 结果 | 描述 | 实体名称 | 实体编号 | | --- | --- | --- | --- | | ? | for all | ∀ | ∀ | | ? | part | ∂ | ∂ | | ? | exists | &exists; | ∃ | | ? | empty | ∅ | ∅ | | ? | nabla | ∇ | ∇ | | ∈ | isin | ∈ | ∈ | | ? | notin | ∉ | ∉ | | ? | ni | ∋ | ∋ | | ∏ | prod | ∏ | ∏ | | ∑ | sum | ∑ | ∑ | | ? | minus | − | − | | ? | lowast | ∗ | ∗ | | √ | square root | √ | √ | | ∝ | proportional to | ∝ | ∝ | | ∞ | infinity | ∞ | ∞ | | ∠ | angle | ∠ | ∠ | | ∧ | and | ∧ | ∧ | | ∨ | or | ∨ | ∨ | | ∩ | cap | ∩ | ∩ | | ∪ | cup | ∪ | ∪ | | ∫ | integral | ∫ | ∫ | | ∴ | therefore | ∴ | ∴ | | ~ | simular to | ∼ | ∼ | | ? | approximately equal | ≅ | ≅ | | ≈ | almost equal | ≈ | ≈ | | ≠ | not equal | ≠ | ≠ | | ≡ | equivalent | ≡ | ≡ | | ≤ | less or equal | ≤ | ≤ | | ≥ | greater or equal | ≥ | ≥ | | ? | subset of | ⊂ | ⊂ | | ? | superset of | ⊃ | ⊃ | | ? | not subset of | ⊄ | ⊄ | | ? | subset or equal | ⊆ | ⊆ | | ? | superset or equal | ⊇ | ⊇ | | ⊕ | circled plus | ⊕ | ⊕ | | ? | cirled times | ⊗ | ⊗ | | ⊥ | perpendicular | ⊥ | ⊥ | | ? | dot operator | ⋅ | ⋅ | ## HTML 支持的希腊字母 | 结果 | 描述 | 实体名称 | 实体编号 | | --- | --- | --- | --- | | Α | Alpha | Α | Α | | Β | Beta | Β | Β | | Γ | Gamma | Γ | Γ | | Δ | Delta | Δ | Δ | | Ε | Epsilon | Ε | Ε | | Ζ | Zeta | Ζ | Ζ | | Η | Eta | Η | Η | | Θ | Theta | Θ | Θ | | Ι | Iota | Ι | Ι | | Κ | Kappa | Κ | Κ | | Λ | Lambda | Λ | Λ | | Μ | Mu | Μ | Μ | | Ν | Nu | Ν | Ν | | Ξ | Xi | Ξ | Ξ | | Ο | Omicron | Ο | Ο | | Π | Pi | Π | Π | | Ρ | Rho | Ρ | Ρ | | Sigmaf | undefined | | Σ | Sigma | Σ | Σ | | Τ | Tau | Τ | Τ | | Υ | Upsilon | Υ | Υ | | Φ | Phi | Φ | Φ | | Χ | Chi | Χ | Χ | | Ψ | Psi | Ψ | Ψ | | Ω | Omega | Ω | Ω | | α | alpha | α | α | | β | beta | β | β | | γ | gamma | γ | γ | | δ | delta | δ | δ | | ε | epsilon | ε | ε | | ζ | zeta | ζ | ζ | | η | eta | η | η | | θ | theta | θ | θ | | ι | iota | ι | ι | | κ | kappa | κ | κ | | λ | lambda | λ | Λ | | μ | mu | μ | μ | | ν | nu | ν | Ν | | ξ | xi | ξ | ξ | | ο | omicron | ο | ο | | π | pi | π | π | | ρ | rho | ρ | ρ | | ? | sigmaf | ς | ς | | σ | sigma | σ | σ | | τ | tau | τ | τ | | υ | upsilon | υ | υ | | φ | phi | φ | φ | | χ | chi | χ | χ | | ψ | psi | ψ | ψ | | ω | omega | ω | ω | | ? | theta symbol | ϑ | ϑ | | ? | upsilon symbol | ϒ | ϒ | | ? | pi symbol | ϖ | ϖ | ## HTML 支持的其他实体 | 结果 | 描述 | 实体名称 | 实体编号 | | --- | --- | --- | --- | | ? | capital ligature OE | Œ | Œ | | ? | small ligature oe | œ | œ | | ? | capital S with caron | Š | Š | | ? | small S with caron | š | š | | ? | capital Y with diaeres | Ÿ | Ÿ | | ? | f with hook | ƒ | ƒ | | ? | modifier letter circumflex accent | ˆ | ˆ | | ? | small tilde | ˜ | ˜ | | ? | en space |   |   | | ? | em space |   |   | | ? | thin space |   |   | | ? | zero width non-joiner | ‌ | ‌ | | ? | zero width joiner | ‍ | ‍ | | ? | left-to-right mark | ‎ | ‎ | | ? | right-to-left mark | ‏ | ‏ | | – | en dash | – | – | | — | em dash | — | — | | ‘ | left single quotation mark | ‘ | ‘ | | ’ | right single quotation mark | ’ | ’ | | ? | single low-9 quotation mark | ‚ | ‚ | | “ | left double quotation mark | “ | “ | | ” | right double quotation mark | ” | ” | | ? | double low-9 quotation mark | „ | „ | | ? | dagger | † | † | | ? | double dagger | ‡ | ‡ | | ? | bullet | • | • | | … | horizontal ellipsis | … | … | | ‰ | per mille  | ‰ | ‰ | | ′ | minutes | ′ | ′ | | ″ | seconds | ″ | ″ | | ? | single left angle quotation | ‹ | ‹ | | ? | single right angle quotation | › | › | |  ̄ | overline | ‾ | ‾ | | € | euro | € | € | | ? | trademark | ™ | ™ | | ← | left arrow | ← | ← | | ↑ | up arrow | ↑ | ↑ | | → | right arrow | → | → | | ↓ | down arrow | ↓ | ↓ | | ? | left right arrow | ↔ | ↔ | | ? | carriage return arrow | ↵ | ↵ | | ? | left ceiling | ⌈ | ⌈ | | ? | right ceiling | ⌉ | ⌉ | | ? | left floor | ⌊ | ⌊ | | ? | right floor | ⌋ | ⌋ | | ? | lozenge | ◊ | ◊ | | ? | spade | ♠ | ♠ | | ? | club | ♣ | ♣ | | ? | heart | ♥ | ♥ | | ? | diamond | ♦ | ♦ |