Brain › GeographyWhat is the 15th letter of the Greek alphabet?Sigma (Σ)Pi (Π)Omicron (Ο)Nu (Ν)AnswerThe correct answer is C) Omicron (Ο).More Geography questionsWhat is the capital of the US State of New York?What is the capital of India?What is the capital of Peru?Which one of these archipelagos are NOT a part of the United Kingdom?Which Canadian province has Charlottetown as its capital?What is the name of the capital of Turkey?Play Brain · Practice