Nine-fold seal script

Nine-fold seal script (simplified Chinese: 九叠篆; traditional Chinese: 九疊篆; pinyin: jiǔ dié zhuàn) or nine-fold script (simplified Chinese: 九叠文; traditional Chinese: 九疊文; pinyin: jiǔ dié wén) is a highly stylised form of Chinese calligraphy derived from small seal script, using rectilinear, highly recurve, convoluted strokes resembling a space-filling curve. It was used for Chinese characters on seals by the Song dynasty, and for both Chinese characters and Khitan Large characters by the Liao dynasty.