Luck
From Memory Alpha, the free Star Trek reference.
Luck is superstitious supposed influence on probability, whether a favorable outcome (good luck) or an unfavorable one (bad luck). Luck is a popular concept in gambling.
Data had Vanessa blow on his dice for good luck. (TNG: "The Royale")
Julian Bashir and Miles O'Brien wished Odo 'good luck' before the constable departed to deal with changeling infiltration on Earth. Odo appreciated the sentiment, though he said that he did not personally believe in luck. (DS9: "Homefront")
Senator Letant stated that Romulans did not believe in luck. (DS9: "Tears of the Prophets")
Michael Eddington owned an heirloom coin that he called his "lucky looney". (DS9: "Blaze of Glory")
