Fu Yin refers to the phenomenon in Bazi where two pillars have identical Heavenly Stem and Earthly Branch combinations, e.g., Year Pillar Jia Zi and Day Pillar Jia Zi. Fu Yin signifies sighing, sorrow, and repetition; when present, matters tend to recur and emotions become melancholic—yet auspicious configurations experiencing Fu Yin may amplify their benefits.
Examine the four pillars of a Bazi chart to identify whether any two pillars share identical Stem-Branch combinations. For example, Year Pillar Jia Zi and Day Pillar Jia Zi constitute Fu Yin. Similarly, Fu Yin also occurs when a Decade Luck Pillar or Annual Pillar matches any pillar in the natal chart.
In a Bazi chart with Year Pillar Jia Zi and Day Pillar Jia Zi, Year-Day Fu Yin manifests, indicating parallel life patterns between youth and middle age and a tendency for events to repeat.