Anyone know what FF stands for? (linkedin.com)

Fast Fourier.

"Very loud"

You're the author of the linkedin post. Why are you asking us what it stands for?

Fast Forward..

or..

https://en.m.wikipedia.org/wiki/FF

Obvious troll post, innit?

Also in some corners it means "for f*ck's sake", cut down for effing effect. Which echoes my thoughts after the first para of the post.