What does FYI and A stand for?

"FYI" stands for "For Your Information". It is a common abbreviation used in emails, text messages, and other forms of communication to indicate that the information being shared is simply for the recipient's knowledge and does not require any action or response.

"A" does not stand for anything in this context. It's likely that you've encountered this in combination with another letter or word. If you provide more context, I can help you understand its meaning.