What are "D" players in fantasy football?

Question

'm playing fantasy football with some friends and they play a differently than i'm used to..

QB, WR, WR, RB, TE, K, DEF, BN, BN, BN, BN, BN

and they're playing with: QB, WR, WR, WR, RB, RB, TE, K, DEF, D, D, BN, BN, BN, BN, BN, BN

I don't even know what D players are, what are they? who are the Better "D" players?..also with rules like this what would be a good draft strategy..i tend to draft a RB first then QB but im not sure if it'll work with a league like this

they're playing

Answer 1

Take Nate Burleson from Seattle... he is #2 WR and KR and PR the kick returns will add points to your score.

Don't know about the "D." Last season my cousin had two defensive players. It could be that- ask your friend setting up the league.