Delta facts for kids
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Quick facts for kids Greek alphabet |
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|---|---|---|---|
| Αα | Alpha | Νν | Nu |
| Ββ | Beta | Ξξ | Xi |
| Γγ | Gamma | Οο | Omicron |
| Δδ | Delta | Ππ | Pi |
| Εε | Epsilon | Ρρ | Rho |
| Ζζ | Zeta | Σσ | Sigma |
| Ηη | Eta | Ττ | Tau |
| Θθ | Theta | Υυ | Upsilon |
| Ιι | Iota | Φφ | Phi |
| Κκ | Kappa | Χχ | Chi |
| Λλ | Lambda | Ψψ | Psi |
| Μμ | Mu | Ωω | Omega |
| Other letters | |||
| Ϝϝ | Digamma | Ϟϟ | Koppa |
| Ϛϛ | Stigma | Ϡϡ | Sampi |
| Ͱͱ | Heta | Ϸϸ | Sho |
| Ϻϻ | San | ||
Delta (uppercase/lowercase Δ δ), is a letter of the Greek alphabet, used to represent the "d" sound in Ancient and Modern Greek. In the system of Greek numerals, it has a value of 4. Letters that came from it include the Roman D and Cyrillic Д.
In mathematics, the upper-case letter Δ can be used as symbol to represent "change" in a variable (e.g., 
). It can also be used to represent discriminant—a key algebraic expression used to determine the number of roots a polynomial has. The lower-case letter 
, on the other hand, is often used to denote small quantities in proofs involving limit, a key concept on calculus is based on.
In molecular chemistry, the lower case Greek letter δ is used to represent a partial charge. This is always less than the unit charge associated with an ion, but has no real fixed value.
A river delta is so named because its shape approximates the upper-case letter delta.
Related pages
See also
In Spanish: Delta para niños
