What is 戊 (wù tǔ) in Chinese metaphysics?

Yang Earth — city walls, embankments and mountains. Signifies depth and reliability, calm steadiness, faithful integrity and resilience.

Original (Chinese): 阳土，城墙堤岸高山之土，主厚德载物、稳重沉静、诚信忠固、抗压强悍。