Pard: Partner.
Re: Rehi.
Rehi: Hello again. (Used when a player loses his connection to a table and rejoins.)
RespX: Responsive Double.
Rev: Reverse as in Reverse Bergen, Reverse Drury
RGB: rec.games.bridge [newsgroup]
RHO: Right Hand Opponent
RKC: Roman Key Card Blackwood.
RONF: Raise Only Non Force. [Usage: Usually applied as a summary of methods for responding to a weak two-bid.]
SAYC: Standard American Yellow Card (Bidding System).
SJS: Strong Jump Shifts.