What is "shigandang"

Shigandang (; Japanese: 石敢當 ishigantō) is an ornamental stone tablet with writings, which is used to exorcise evil spirits in east Asia. The Shigandang are often associated with Mount Tai and are often placed on street intersections or three-way junctions, especially in the crossing, which is often considered a fierce place . Many Shigandang have been replaced by stone written with Nāmó Ēmítuófó.