The story
Late 20th c., from the Hanyu Pinyin romanization of Mandarin 莒光 (Jǔguāng, literally “the glory of Ju”). The glory of Ju references the spirit of recovering a lost country following the example of Tian Dan when he recovered the state of Qi from the small base area of Ju; the spirit of building a hardworking, thrifty military to carry forward the mission of the recovery of lost territory. By analogy, to apply to the situation of the Republic of China on Taiwan and mainland China under the People's Republic of China.
Etymology from Wiktionary, CC BY-SA 4.0.