Fortune's Favor (3.5e Feat)
From D&D Wiki
Fortune's Favor [general]
You can force the hand of fate to move in your favour.
Prerequisite: 3rd level, Cha 13+
Benefit: Once per day, you can reroll one roll you have just made. You must take the result of the reroll, even if it’s worse than the original roll.
Special: This feat stacks with the granted ability from the clerical Luck domain. If you have both the feat and the domain, you can make two rerolls per day. However, you can only reroll any particular roll once.