What does the letter y look like in Greek?

In Greek, the letter that corresponds to the English "y" is called "upsilon," and it is written as "Υ" in uppercase and "υ" in lowercase. Upsilon looks somewhat similar to the English letter "Y" in its uppercase form, but the lowercase version resembles a rounded "u" with a tail. It represents the sound "u" or "y" depending on its position in Words.