Fallout: New Vegas Luck

Luck is one of the seven primary statistics in the SPECIAL system.

Background
Luck raises the value of every skill and affects Critical Chance. It also improves the odds of winning at any casino game; the higher the Luck, the more likely favorable outcomes on bets will be. If having won a casino bet through the influence of Luck, the "You feel lucky" message is displayed. A Luck of 6 will begin to influence Roulette and Slot machines, though rarely. A Luck of 7 is required to win with any regularity or to begin to influence Blackjack outcomes.

Permanent

 * Luck Implant available at the New Vegas medical clinic (+1)
 * Intense Training perk (+1)
 * Completing the quest The Apocalypse or The End will allow raising any one primary statistic by 1.

Temporary

 * Armor and clothing
 * Naughty nightwear (+1)
 * Lucky shades (+1) (Added to the game after the 1.2 patch.)
 * "Blackjack" variant of the Courier duster (+1)
 * Perks
 * Meat of Champions perk (+1 for 60 seconds after eating a corpse.)
 * Just Lucky I'm Alive (+4 after finishing a fight with less than 25% health)
 * Traits
 * Claustrophobia (+1 while outdoors, but -1 indoors)
 * Early Bird (+2 between 6am and 12pm, but -1 between 6pm and 6am)