The name of the letter was originally just "υ" (y; also called hy, hence "hyoid", meaning "shaped like the letter υ"), but the name changed to "υ … See more

The usage of Y in Latin dates back to the first century BC. It was used to transcribe loanwords from Greek, so it was not a native sound of Latin … See more

Upsilon is known as Pythagoras' letter, or the Samian letter, because Pythagoras used it as an emblem of the path of virtue or vice. As the … See more

In early Attic Greek (6th century BCE), it was pronounced [u] (a close back rounded vowel like the English "long o͞o"). In Classical Greek, it was pronounced [y] (a close front rounded … See more

• In particle physics the capital Greek letter ϒ denotes an Upsilon particle. Note that the symbol should always look like $${\displaystyle \,\Upsilon }$$ in order to avoid confusion with a Latin Y denoting the hypercharge. This may be done either with a font such as … See more

• Merrifield, Michael (2009). "Υ – Mass to Light Ratio". Sixty Symbols. Brady Haran for the University of Nottingham. See more