Δ

Symbol

Δ

1. (mathematics, sciences) Alternative form of ∆: change in a variable
2. (chemistry) Used on the reaction arrow in a chemical equation, to show that energy in the form of heat is added to the reaction
3. (mathematics, set theory) Used to represent the symmetric difference (also known as the disjunctive union) of two sets
4. (genetics) Used before a gene name as a modifier to denote a deletion mutation of that gene.
5. (music) Used after a pitch class to denote a major seventh chord with a note of said pitch as its root.

Noun

Δ

1. (law) Abbreviation of defendant.

Pronunciation

• IPA^(key): /ð(ə)/

Letter

Δ (Dh) (upper case Δ, lower case δ)

1. The 6th letter of the Arvanitic Albanian Greek-script alphabet.

Etymology

From the Phoenician letter 𐤃 (d, “dālet”).

Letter

Δ • (D) (uppercase, lowercase δ)

1. The letter delta (δέλτα (délta)), the fourth letter of the ancient Greek alphabet.

Pronunciation

• IPA^(key): /ð/

Letter

Δ (lower case δ)

1. A letter of the Cypriot Arabic alphabet, written in the Latin script.

Adjective

Δ • (D)

1. Abbreviation of δυτικός (dytikós, “west, westerly”).

Noun

Δ • (D)

1. Abbreviation of δύση (dýsi, “west”).

Letter

Δ • (D) (uppercase, lowercase δ)

1. The upper case delta (δέλτα), the fourth letter of the modern Greek alphabet, representing a voiced interdental fricative (/ð/).

Pronunciation

• IPA^(key): /ð/

Letter

Δ (lower case δ)

1. A letter of the Wakhi alphabet, written in the Latin script.