Literature Reference: 更忆八行前日到，含凄为报秣陵书。—— 《哭张十八校书》 I still remember the eight lines that arrived the other day, filled with sorrow to report the letter from Moling. Source from 'Kui Zhang Shibaxiao Shu'.
八: Numbers, the eight directions, the eight extremities.
行: Proficient in a certain matter, it generally signifies smooth progress in all affairs, with the character "Zhi" carrying auspicious connotations.
Meaning: Eight lines refer to letters, symbolizing communication, transmission, and nostalgia.