The shell bone script for character Boundary is
the middle is Person, who is surrounded by four dots, which experts believe are the indicative points to represent the cover armor on a solider who is protected by the boundary of the armor created.
The small seal script for Boundary is
The middle is the person, the four dots become two lines, more like the armor.
The clerical script for the character is
The Pinyin for 介 is Jie4.