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Delta (/ˈdɛltə/;[1] uppercase Δ, lowercase δ; Greek: δέλτα, délta, [ˈðelta])[2] is the fourth letter of the Greek alphabet. In the system of Greek numerals it has a value of 4. It was derived from the Phoenician letter dalet 𐤃.[3] Letters that come from delta include Latin D and Cyrillic Д.
A river delta (originally, the delta of the Nile River) is so named because its shape approximates the triangular uppercase letter delta. Contrary to a popular legend, this use of the word delta was not coined by Herodotus.[4]
In Ancient Greek, delta represented a voiced dental plosive IPA: [d]. In Modern Greek, it represents a voiced dental fricative IPA: [ð], like the "th" in "that" or "this" (while IPA: [d] in foreign words is instead commonly transcribed as ντ). Delta is romanized as d or dh.
The uppercase letter Δ is used to denote:
The lowercase letter δ (or 𝛿) can be used to denote:
Preview | Δ | δ | ᵟ | Ⲇ | ⲇ | |||||
---|---|---|---|---|---|---|---|---|---|---|
Unicode name | GREEK CAPITAL LETTER DELTA | GREEK SMALL LETTER DELTA | MODIFIER LETTER SMALL DELTA | COPTIC CAPITAL LETTER DALDA | COPTIC SMALL LETTER DALDA | |||||
Encodings | decimal | hex | dec | hex | dec | hex | dec | hex | dec | hex |
Unicode | 916 | U+0394 | 948 | U+03B4 | 7519 | U+1D5F | 11398 | U+2C86 | 11399 | U+2C87 |
UTF-8 | 206 148 | CE 94 | 206 180 | CE B4 | 225 181 159 | E1 B5 9F | 226 178 134 | E2 B2 86 | 226 178 135 | E2 B2 87 |
Numeric character reference | Δ |
Δ |
δ |
δ |
ᵟ |
ᵟ |
Ⲇ |
Ⲇ |
ⲇ |
ⲇ |
Named character reference | Δ | δ | ||||||||
DOS Greek | 131 | 83 | 155 | 9B | ||||||
DOS Greek-2 | 167 | A7 | 221 | DD | ||||||
Windows 1253 | 196 | C4 | 228 | E4 | ||||||
TeX | \Delta | \delta |
Preview | ẟ | ƍ | ||
---|---|---|---|---|
Unicode name | LATIN SMALL LETTER DELTA | LATIN SMALL LETTER TURNED DELTA | ||
Encodings | decimal | hex | dec | hex |
Unicode | 7839 | U+1E9F | 397 | U+018D |
UTF-8 | 225 186 159 | E1 BA 9F | 198 141 | C6 8D |
Numeric character reference | ẟ |
ẟ |
ƍ |
ƍ |
Preview | ∆ | ∇ | ≜ | ⍋ | ⍍ | ⍙ | ||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Unicode name | INCREMENT | NABLA | DELTA EQUAL TO | APL FUNCTIONAL SYMBOL DELTA STILE | APL FUNCTIONAL SYMBOL QUAD DELTA | APL FUNCTIONAL SYMBOL DELTA UNDERBAR | ||||||
Encodings | decimal | hex | dec | hex | dec | hex | dec | hex | dec | hex | dec | hex |
Unicode | 8710 | U+2206 | 8711 | U+2207 | 8796 | U+225C | 9035 | U+234B | 9037 | U+234D | 9049 | U+2359 |
UTF-8 | 226 136 134 | E2 88 86 | 226 136 135 | E2 88 87 | 226 137 156 | E2 89 9C | 226 141 139 | E2 8D 8B | 226 141 141 | E2 8D 8D | 226 141 153 | E2 8D 99 |
Numeric character reference | ∆ |
∆ |
∇ |
∇ |
≜ |
≜ |
⍋ |
⍋ |
⍍ |
⍍ |
⍙ |
⍙ |
Named character reference | ∇, ∇ | ≜, ≜ |
Preview | 𝚫 | 𝛅 | 𝛥 | 𝛿 | 𝜟 | 𝜹 | ||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Unicode name | MATHEMATICAL BOLD CAPITAL DELTA |
MATHEMATICAL BOLD SMALL DELTA |
MATHEMATICAL ITALIC CAPITAL DELTA |
MATHEMATICAL ITALIC SMALL DELTA |
MATHEMATICAL BOLD ITALIC CAPITAL DELTA |
MATHEMATICAL BOLD ITALIC SMALL DELTA | ||||||
Encodings | decimal | hex | dec | hex | dec | hex | dec | hex | dec | hex | dec | hex |
Unicode | 120491 | U+1D6AB | 120517 | U+1D6C5 | 120549 | U+1D6E5 | 120575 | U+1D6FF | 120607 | U+1D71F | 120633 | U+1D739 |
UTF-8 | 240 157 154 171 | F0 9D 9A AB | 240 157 155 133 | F0 9D 9B 85 | 240 157 155 165 | F0 9D 9B A5 | 240 157 155 191 | F0 9D 9B BF | 240 157 156 159 | F0 9D 9C 9F | 240 157 156 185 | F0 9D 9C B9 |
UTF-16 | 55349 57003 | D835 DEAB | 55349 57029 | D835 DEC5 | 55349 57061 | D835 DEE5 | 55349 57087 | D835 DEFF | 55349 57119 | D835 DF1F | 55349 57145 | D835 DF39 |
Numeric character reference | 𝚫 |
𝚫 |
𝛅 |
𝛅 |
𝛥 |
𝛥 |
𝛿 |
𝛿 |
𝜟 |
𝜟 |
𝜹 |
𝜹 |
Preview | 𝝙 | 𝝳 | 𝞓 | 𝞭 | ||||
---|---|---|---|---|---|---|---|---|
Unicode name | MATHEMATICAL SANS-SERIF BOLD CAPITAL DELTA |
MATHEMATICAL SANS-SERIF BOLD SMALL DELTA |
MATHEMATICAL SANS-SERIF BOLD ITALIC CAPITAL DELTA |
MATHEMATICAL SANS-SERIF BOLD ITALIC SMALL DELTA | ||||
Encodings | decimal | hex | dec | hex | dec | hex | dec | hex |
Unicode | 120665 | U+1D759 | 120691 | U+1D773 | 120723 | U+1D793 | 120749 | U+1D7AD |
UTF-8 | 240 157 157 153 | F0 9D 9D 99 | 240 157 157 179 | F0 9D 9D B3 | 240 157 158 147 | F0 9D 9E 93 | 240 157 158 173 | F0 9D 9E AD |
UTF-16 | 55349 57177 | D835 DF59 | 55349 57203 | D835 DF73 | 55349 57235 | D835 DF93 | 55349 57261 | D835 DFAD |
Numeric character reference | 𝝙 |
𝝙 |
𝝳 |
𝝳 |
𝞓 |
𝞓 |
𝞭 |
𝞭 |
These characters are used only as mathematical symbols. Stylized Greek text should be encoded using the normal Greek letters, with markup and formatting to indicate text style.