Delta (letter) (English Wikipedia)

"Greek Alphabet". Ancient Symbols. Retrieved 2025-01-31. Dr. John Dee, a mathematician, used the lowercase Delta symbol to represent himself in manuscripts.
"Greek Alphabet". Ancient Symbols. Retrieved 2025-01-31. In astronomy, the symbol is used to represent the declination of an object.

archive.org (Global: 6^th place; English: 6^th place)

Clarence H. Richardson (1954). An Introduction to the Calculus of Finite Differences. Van Nostrand. Chapter 1, pp. 1—3.online copy

books.google.com (Global: 3^rd place; English: 3^rd place)

Dickenstein, Alicia; Emiris, Ioannis Z. (2005). Solving polynomial equations: foundations, algorithms, and applications. Springer. Example 2.5.6, p. 120. ISBN 978-3-540-24326-7.
Irving, Ronald S. (2004). Integers, polynomials, and rings. Springer-Verlag New York, Inc. Ch. 10.1, pp. 145. ISBN 978-0-387-40397-7.
Tepper, Pamela (2014). The Law of Contracts and the Uniform Commercial Code. Cengage Learning. p. 32. ISBN 978-1285448947. Retrieved 2018-04-30.

doi.org (Global: 2^nd place; English: 2^nd place)

Celoria, Francis (1966). "Delta as a geographical concept in Greek literature". Isis. 57 (3): 385–388. doi:10.1086/350146. JSTOR 228368. S2CID 143811840.
"Declination", The Encyclopedia of Astronomy and Astrophysics, IOP Publishing Ltd, 2001, doi:10.1888/0333750888/4541, ISBN 0-333-75088-8, retrieved 2025-01-31

duke.edu (Global: 1,851^st place; English: 1,041^st place)

econ.duke.edu

"Faculty - Economics Department". econ.duke.edu. Retrieved 26 October 2017.

greek-language.gr (Global: low place; English: low place)

"Dictionary of Standard Modern greek". Centre for the Greek Language.

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babel.hathitrust.org

Clarence H. Richardson (1954). An Introduction to the Calculus of Finite Differences. Van Nostrand. Chapter 1, pp. 1—3.online copy

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"Every chord symbol found on lead sheets". Jazz-Library. Retrieved 2025-01-23. Chord with a triangle Major 7th "C△"

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Celoria, Francis (1966). "Delta as a geographical concept in Greek literature". Isis. 57 (3): 385–388. doi:10.1086/350146. JSTOR 228368. S2CID 143811840.

macroption.com (Global: low place; English: low place)

"Black-Scholes Formulas (d1, d2, Call Price, Put Price, Greeks) - Macroption". www.macroption.com. Retrieved 2025-01-23. Delta is the first derivative of option price with respect to underlying price S.

merriam-webster.com (Global: 425^th place; English: 373^rd place)

"Definition of DELTA". www.merriam-webster.com. Retrieved 26 October 2017.

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"delta". Oxford English Dictionary (online ed.). Oxford University Press. (Subscription or participating institution membership required.)

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Celoria, Francis (1966). "Delta as a geographical concept in Greek literature". Isis. 57 (3): 385–388. doi:10.1086/350146. JSTOR 228368. S2CID 143811840.

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"Who first defined the "equal-delta" or "delta over equal" symbol?". Archived from the original on 6 March 2022. Retrieved 2 October 2022.

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plato.stanford.edu

Shramko, Yaroslav; Wansing, Heinrich (2010-03-30). "Truth Values". {{cite journal}}: Cite journal requires |journal= (help)

web.archive.org (Global: 1^st place; English: 1^st place)

"Caduceus, the emblem of dentistry". American Dental Association. Archived from the original on 12 November 2012. Retrieved 26 October 2017.
"Who first defined the "equal-delta" or "delta over equal" symbol?". Archived from the original on 6 March 2022. Retrieved 2 October 2022.

wolfram.com (Global: 1,091^st place; English: 1,169^th place)

mathworld.wolfram.com

Weisstein, Eric W. "Triangle Area". mathworld.wolfram.com. Retrieved 2025-01-23.
Weisstein, Eric W. "Symmetric Difference". mathworld.wolfram.com. Retrieved 2025-01-31. The symmetric difference of sets A and B is variously written as A ⊖ B, A∇ B, A+B (Borowski and Borwein 1991) or AΔB (Harris and Stocker 1998, p. 3). All but the first notation should probably be deprecated since each of the other symbols has a common meaning in other areas of mathematics.
Weisstein, Eric W. "Epsilon-Delta Proof". mathworld.wolfram.com. Retrieved 2025-01-31.
Weisstein, Eric W. "Kronecker Delta". mathworld.wolfram.com. Retrieved 2025-01-23.
Weisstein, Eric W. "Central Difference". mathworld.wolfram.com. Retrieved 2025-01-31.
Weisstein, Eric W. "Delta Function". mathworld.wolfram.com. Retrieved 2025-01-23.
Weisstein, Eric W. "Silver Ratio". mathworld.wolfram.com. Retrieved 2025-01-31.

Delta (letter) (English Wikipedia)

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