Delta facts for kids

Quick facts for kids Greek alphabet
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 (written as Δ for uppercase and δ for lowercase) is the fourth letter of the Greek alphabet. It makes a "d" sound, just like the letter D in English. People in Ancient Greece used it, and it's still used in the Greek language today.

In the system of Greek numerals, Delta has a value of 4. Other letters that came from Delta include the Roman letter D (which we use in English) and the Cyrillic letter Д.

Delta in Math

In mathematics, the uppercase letter Δ (Delta) is often used to show a "change" in something. For example, if you see , it means "the change in x."

Delta can also stand for the discriminant. This is a special part of an algebraic equation that helps you figure out how many solutions (or "roots") the equation has.

The lowercase letter δ (delta) is used in more advanced math, like calculus. It often represents a very small amount or a tiny difference in a number.

Delta in Chemistry

In molecular chemistry, the lowercase δ (delta) is used to show a "partial charge" on an atom within a molecule. This means the atom has a slight electrical charge, but it's not a full charge like you'd find on an ion. It's like a tiny, uneven distribution of electrons.

River Deltas

You might have heard of a river delta. This is a landform that looks like a triangle, formed where a river splits into smaller streams before flowing into a larger body of water, like an ocean or a lake. It's called a "delta" because its shape often looks a lot like the uppercase Greek letter Delta (Δ).

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