bo.chan denotes the testing quality ascribed to the stone founded in Zion.

The sole attested use presents bo.chan as the testing quality attributed to the stone that the Lord GOD founds in Zion.

1. Testing quality of the Zion stone · dominant

   In Isaiah 28:16, the masculine singular absolute noun occurs in the declaration that a stone is being founded in Zion. The APB renders the clause "a stone, a testing stone, a precious cornerstone," linking the term to that stone's stated testing characterization.

   Isaiah 28:16

In the Anselm Project Bible: In Isaiah 28:16, the APB presents the term within "a testing stone." This identifies the clause's presentation rather than a precise token-by-token rendering.