Which English letter is represented by "Ο" in Greek?

The letter "Ο" in Greek corresponds to the English letter "O." In the Greek alphabet, "Ο" is known as "Omicron," which is the 15th letter. It is a vowel and phonetically represents the same sound as the English "O." This makes it a straightforward match for the English alphabet, reinforcing the idea that Greek letters often have direct parallels with their English counterparts, particularly in this instance where "Ο" visually resembles "O" as well. Recognizing these similarities is crucial for understanding the basics of the Greek alphabet in relation to English.