Wu Collection, Lower Volume Radical: Stone (shí) 碍 Kangxi strokes: 19 Page 832, Entry 04 Zhengzitong (Zhengzitong): This is a common variant form of the character for obstruction (ài). Obstruction (ài) Tangyun (Tangyun): Pronounced ài (falling tone). Jiyun (Jiyun), Yunhui (Yunhui): Pronounced ài (falling tone). Pronounced exactly the same as (ài). Sometimes also written in a variant form (ài). Used interchangeably with (hé). In the History of the Southern Dynasties (Nan shi), when quoting Buddhist scriptures, it is written in a variant form. Shuowen (Shuowen): Means to stop or prevent. It also carries meanings of resisting, hindering, obstructing, or blocking. Yangzi Fayan (Yangzi Fayan): The sages govern the world by using ritual and music to regulate and constrain. Jiyun (Jiyun): Pronounced yí (rising tone). Obstruction (ài): Refers to a type of blue stone. Also rhyming with the sound yì (falling tone). Su Zhe Yue Xia Shi (Su Zhe, Poems Below the Mountain): The mountains and forests have room for everything, yet my exhaustion and weariness become my own obstruction. Knowing well how deep the worldly entanglements go, only in old age do I retreat from the bustling markets. Hui, pronounced qiú (rising tone).