Greek Letter U, Looks Like a Y Upper Case
This page is the CodyCross answer for the clue below from Space Exploration, Group 918, Puzzle 4 (Extraterrestrial).
Question is: Greek Letter U, Looks Like a Y Upper Case
and the answer is: UPSILON
Word Meaning:
UPSILON — The twentieth letter of Classical and Modern Greek; the twenty-second letter of Old and Ancient Greek.
Definitions from Wiktionary.