圜

Physical perimeters and boundaries; the geometric curvature of objects such as coinage and ritual vessels. In cosmological contexts, it refers to the vaulted structure of Heaven (a structural dome).

Frequently functions as a verb meaning to encircle, surround, or draw a perimeter.

Often distinguished from 圓: while 圓 typically denotes the abstract quality of roundness or completion, 圜 refers to the physical entity of the circle or a formal structural boundary.

When both glyphs appear in the same text, look for a functional distinction between the qualitative/abstract (圓) and the structural/physical (圜). In ambiguous contexts, consider whether the meaning leans toward a static shape or a returning motion.