In some languages, including German and Portuguese, the name upsilon (Ypsilon in German, ípsilon in Portuguese) is used to refer to the Latin letter Y as well as the Greek letter.

Share Kids Definition upsilon noun up· si· lon ˈyüp-sə-ˌlän ˈəp- -lən : the 20th letter of the Greek alphabet

Upsilon or ypsilon is the twentieth letter of the Greek alphabet. In the system of Greek numerals, Υʹ has a value of 400. It is derived from the Phoenician waw ...

It is the equivalent of the phi (strange quark, strange antiquark), psi (charm quark, charm antiquark) and upsilon (bottom quark, bottom antiquark) mesons.

Oct 27, 2025 · Noun [edit] upsilon (plural upsilons or upsila) The twentieth letter of Classical and Modern Greek; the twenty-second letter of Old and Ancient Greek. (particle physics) An …

Upsilon (uppercase Υ, lowercase υ) is the 20th letter of the Greek alphabet. In the Greek number system, this letter was taken as the symbol of the number 400.

Dive into the captivating odyssey of Upsilon, the 20th letter of the Greek alphabet, from its origins in ancient scripts to its role in the forefront of modern science and technology.

Upsilon (uppercase/lowercase Υ υ), otherwise known as simply u, is the 20th letter of the Greek alphabet. It is used to represent the "u" sound in Ancient Greek and "i" in Modern Greek.

Upsilon (Υ, υ) or ypsilon is the 20th letter of the Greek alphabet. In the system of Greek numerals, Υʹ has a value of 400.

Definition of upsilon noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.