TYP: Thank you, partner.
UI: Unauthorized Information. Knowledge that a player is not entitled to use ( as, for example, that obtained through partner's uneven tempo).
U2N: Unusual 2NT.
UDCA: Upside Down Count and Attitude. As opposed to Std. carding (High for encouragement & Even cards & low for discouragement & odd no. of cards)
Ur: Your.
WD: Well done.
WDO: Well Done, Opponents
WDP: Well done, partner.
WJO: Weak Jump Overcall.
WJS: Weak Jump Shift.
WPP: Well played partner