Delta

Common letters
Αα	Alpha	Νν	Nu
Ββ	Beta	Ξξ	Xi
Γγᴦ	Gamma	Οο	Omicron
Δδ	Delta	Ππ	Pi
Εεϵ϶	Epsilon	ΡρῬῥῤ	Rho
Ζζ	Zeta	ΣσςϹϲ	Sigma
Ηη	Eta	Ττ	Tau
Θθ	Theta	Υυ	Upsilon
Ιι	Iota	Φφ	Phi
Κκ	Kappa	Χχ	Chi
Λλᴧ	Lambda	Ψψᴪ	Psi
Μμ	Mu	Ωω	Omega
Uncommon letters
ϜϝͶͷ	Digamma	ϞϟϘϙ	Qoppa
Ϻϻ	San	ϠϡͲͳ	Sampi
Other letters
Ϛϛ	Stigma	Ϸϸ	Sho
ͰͱⱵⱶ	Heta	ϳ	Yot
Greek alphabet

For the place where a river ends, see River delta.

Delta (uppercase/lowercase Δ δ), is the 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.

The upper-case letter Δ can be used as symbol representing "change".

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.

it is basically just a triangle