Forgive the cryptic title. I couldn’t resist. So, what does it mean? 16vT is shorthand for the player hand of sixteen against a dealer upcard of Ten. “RS” is a strategy abbreviation. “R” means SuRRender, and “S” means Stand. So, “RS” means Surrender if you can, otherwise Stand.
And of course, WTF is an abbreviation of the message I often get via email when someone thinks they have found a mistake in the strategy provided by my Blackjack Basic Strategy Engine.