What is the symbol for voltage?

Could you please clarify for me, what is the standard symbol used to represent voltage in electrical circuits and equations? I'm trying to ensure that my understanding is accurate, as I work with electrical systems on a regular basis and want to ensure that I'm using the correct notation. I believe it's a letter from the Greek alphabet, but I'd appreciate if you could confirm the exact symbol and its pronunciation for me. Thank you in advance for your help!