What is 三奇 (sān qí) in Chinese metaphysics?

The three Noble stems — Yi (Sun Noble), Bing (Moon Noble) and Ding (Star Noble) — most treasured in Qi Men for their power to resolve misfortune.

Original (Chinese): 乙(日奇)、丙(月奇)、丁(星奇)三个天干,因可解厄化凶而在奇门中最为珍贵。