Literature Reference: The golden sword, once quenched, pierces through the long sheath. Source from 'Xi Yu Wei Zuo Cheng Tong Ru Nan Sheng Yin Xu Jiu Yi Zeng Zhi'.
长: Strengths, merits.
匣: A container for collecting items, typically referring to a small, lidded box that can be opened and closed.
Meaning: The long sheath symbolizes the sharpness of the sword, implying that inner talent and strength are well-preserved, ready to shine at the right moment.