watchman's rattle
梆 refers to a wooden percussion instrument used by watchmen to signal or alert, essentially a rattle or clapper.
梆 combines 木 (wood) with 邦, which likely contributes the sound ホウ. The character denotes a wooden instrument, fitting the semantic component.
The left side 木 shows it is made of wood, and the right side 邦 suggests a country or territory. Imagine a wooden rattle used by a watchman patrolling the borders of a country.
For ホウ, picture a watchman blowing a wooden whistle that makes a deep 'hoe' sound: hoe -> ホウ, and the wooden rattle alerts the town.
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