Flag ↔ indicator in torrent client to describe status of Peer intent/discovery/connection

d

(Flag) YOU Interested to download & Peer Choked

D

(Flag) YOU Interested to download & Peer Unchoked

E

(Flag) Encrypted Traffic

I

(Flag) Incoming connection

P

(Flag) UDP connection

S

(Flag) Peer Snubbed

u

(Flag) Peer Interested to DL from YOU BUT YOU Choked

U

(Flag) YOU Upload & Unchoked

X

(Flag) discover from PeX

References