net radical variant (no. 122)
罓 is a variant form of the net radical (⺫), used as a component in other characters. Its standalone meaning is tied to nets or net-like structures.
罓 is a variant form of the net radical (⺫), historically derived from a pictograph of a net. The exact development of this variant is uncertain.
The outer 冂 looks like a frame, and the inner 㐅 looks like crossed threads. Together they form a net.
For モウ, imagine a mower catching grass clippings in a net: mow -> モウ, and the net collects the clippings.