What is 2nd letter of greek alphabet?

The 2nd letter of the Greek alphabet is called Beta (uppercase Β, lowercase β). It has a numerical value of 2. Beta is derived from the Phoenician letter beth, which also means "house" or "dwelling". In ancient Greece, beta was pronounced as the voiced bilabial plosive [b]. In modern Greek, it is pronounced as the voiced labiodental fricative [v]. Beta is commonly used in mathematics, science, and engineering as a symbol for different concepts, such as beta testing, beta decay, beta version, etc. In finance, beta is used as a measure of a stock's volatility compared to the overall market. The Beta function, Beta distribution, Beta regression, and Beta wave are some of the mathematical concepts named after this letter.