Editing Upsilon (section)

==Symbolism==
[[File:Geoffrey Tory Ypsilon.jpg|thumb|[[Geoffroy Tory]] Ypsilon]]
Upsilon is known as Pythagoras' letter, or the Samian letter, because [[Pythagoras]] used it as an emblem of the path of virtue or vice.<ref>Brewer, Ebenezer Cobham. ''The reader's handbook of famous names in fiction, allusions, references, proverbs, plots, stories, and poems'', [https://books.google.com/books?id=n3kjAQAAIAAJ&pg=PA956&q=%22samian%20letter%22 Vol. 2, p. 956]. Lippincott, 1899.</ref> As the Roman writer [[Persius]] wrote in ''Satire III'':
{{quote|and the letter which spreads out into Pythagorean branches has pointed out to you the steep path which rises on the right.<ref>{{cite book|author=Persius|title=Satires|year=1920|url=https://archive.org/stream/juvenalpersiuswi00juveuoft/juvenalpersiuswi00juveuoft_djvu.txt|author-link=Persius}}</ref>}}
[[Lactantius]], an early Christian author (ca. 240 – ca. 320), refers to this: 
{{quote|For they say that the course of human life resembles the letter Y, because every one of men, when he has reached the threshold of early youth, and has arrived at the place "where the way divides itself into two parts," is in doubt, and hesitates, and does not know to which side he should rather turn himself.<ref>{{cite book|author=Lactatius|title=The Divine Institutes|pages=Book VI Chapter III|url=http://en.wikisource.org/wiki/Ante-Nicene_Fathers/Volume_VII/Lactantius/The_Divine_Institutes/Book_VI/Chap._III|author-link=Lactantius}}</ref>}}