Upsilon

[Sarah]

The 20th letter (U, u) of the Greek alphabet, a vowel havingoriginally the sound of oo as in room, becoming before the 4thcentury b. c. that French u or Ger. ü. Its equivalent in English is uor y.

[Couch Potatoe]

[Upsilon] is a Youtuber and staff on [Cookiepawz] [discord server].
Upsilon is also a modern Microsoft DOS Virus.