Wikipedia Easy Search

Look up Upsilon, upsilon, υ, Υ, Ʊ, or ʊ in Wiktionary, the free dictionary.

Upsilon (Υ or υ) is the 20th letter of the Greek alphabet.

Upsilon may also refer to:

Latin upsilon (Ʊ or ʊ), a Latin letter
Lake Upsilon
Upsilon meson (ϒ)