'Phags-pa script
Phags-pa was written in a variety of graphic forms. The standard form (top, at right) was blocky, but a "Tibetan" form (bottom) was even more so, consisting almost entirely of straight orthogonal lines and right angles. A "seal script" form (Chinese 蒙古篆字 "měnggǔ zhuànzì" "Mongolian Seal Script"), used for imperial seals and the like, was more elaborate, with squared sinusoidal lines and spirals. This 'Phags-pa script is different from the 'Phags-pa script, or 八思巴字 in Chinese, that shares the same name but its earliest usage can be traced back to the late 16th century, the early reign of Wanli Emperor. According to Professor Junast 照那斯图 of the Chinese Academy of Social Sciences, the later 'Phags-pa script is actually a seal script of Tibetan.