# 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** (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

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