Literature Reference: 长空悠悠霁日悬，六翮不动凝飞烟。—— 《琴曲歌辞 飞鸢操》 The vast sky stretches endlessly, the clear sun hangs, and the six wings remain motionless, condensing the flying smoke. Source from 'Feiyuan Cao'.
长: Strengths, merits.
空: The heavens, the expanse.
Meaning: The vast sky symbolizes boundless horizons, representing a broad mind and lofty aspirations.