Υυ

UPSILON

ὖ ψιλόν · [u]

The 20th letter of the Greek alphabet.

MATHEMATICS

  • Seldom used; sometimes in special functions.
  • May be used as an auxiliary variable.

PROBABILITY

  • Rare as a standard; depends on the author.

STATISTICS

  • Rare; if used, it's a material-specific convention.

PRONUNCIATION

Ancient Greek
sound [u]
Modern Greek
ύψιλον [ˈipsilon] · sound [i]

HOW TO WRITE IT — click to copy

lowercase
uppercase

DON'T CONFUSE IT

  • υ u ν v υ is round at the bottom and open at the top, without the little tail of the Latin u.

Note: notations vary between books/fields; these are the most common usages.