Literature Reference: 诞降嘉种，维秬维秠。—— 《诗经·大雅·生民》 The noble seeds were bestowed, both black millet and 'Pi'. Source from 'The Book of Songs, Da Ya, Sheng Min'.
秠: Black millet and grain husks.
Meaning: 'Pi' refers to a high-quality black millet, symbolizing harvest and abundance.