What is H in the Greek Alphabet?

In the Greek alphabet, the letter H is represented by the symbol Η (uppercase) and η (lowercase). This letter is called ‘Eta’ and is the seventh letter of the Greek alphabet. Eta is pronounced as ‘ee-tah’ in modern Greek. Historically, Eta was used to represent the long ‘e’ sound in ancient Greek, but in modern Greek, it represents a vowel sound similar to the ‘ee’ in ‘see’. The letter Eta is also used in various scientific and mathematical contexts, such as in the notation for efficiency in physics and engineering.