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text-mode.org

Old Tibetan calligraphy by Tshe-tan Zhabs-drung ཚེ་ཏན་ཞབས་དྲུང followed by the Tibetan Phags-pa fonts by Babelstone and the square Mongolian style of Phags-pa used for decoration.

Seems to originate from the 1200s and is sometimes called square script. Also see the arabic square kufi.

Thanks to µB for the heads up! More here.