| Index: > A B C D E F G H I J K L M N O P Q R S T U V W X Y Z |
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| Greek alphabet | |
| Alpha | Beta |
| Gamma | Delta |
| Epsilon | Digamma |
| Zeta | Eta |
| Theta | Iota |
| Kappa | Lambda |
| Mu | Nu |
| Xi | Omicron |
| Pi | San |
| Qoppa | Rho |
| Sigma | Tau |
| Upsilon | Phi |
| Chi | Psi |
| Omega | Sampi |
Delta (upper case Δ, lower case δ) is the 4th letter of the Greek alphabet. In the system of Greek numerals it has a value of 4.
A river delta is named after the letter delta because it has roughly the triangular shape of the upper-case delta.
The upper-case letter Δ is used as the symbol for:
The lower-case letter δ is used as the symbol for:
Letters that arose from Delta include the Roman D and the Cyrillic letter De .