Upsilon in a sentence as a noun

That's an upsilon in the middle and a delta at the end.

The "psilon" in both "upsilon" and "epsilon" meant somethign like "simple" in Greek.

Really confusing that they use mu when upsilon is available...

In English at least, the corresponding Greek letter is normally spelled "upsilon", which is obviously similar.

Upsilon definitions

noun

the 20th letter of the Greek alphabet