Literature Reference: 大包天域，长亘不极。—— 《郊庙歌辞 享太庙乐章 福和》 Vast as the heavens, enduring without end. Source from 'Jiao Miao Ge Ci Xiang Tai Miao Yue Zhang Fu He'.
长: Strengths, merits.
亘: Unceasingly continuous (in space or time).
Meaning: Long-lasting and enduring, symbolizing boundless vastness and unyielding spirit.