FourtyOneLetters

Research A: Woodblock-printed Chinese book page presenting the ʼPhags-pa script: columns of angular Mongol square letters glossed with Chinese characters B: Second woodblock page of the ʼPhags-pa primer: tall columns of angular square-script letters, each glossed with small Chinese characters

explained on: http://www.babelstone.co.uk/Phags-pa/41Letters.html