country
囶 centers on the concept of a country or nation, a bounded territory with its own identity.
囶 is a rare variant of 国, combining the enclosure 囗 (boundary) with ハ and 土 (earth), likely emphasizing a territorial country. Its exact historical development is uncertain.
The outer 囗 is a border, and inside are ハ (like a flag) and 土 (earth). Picture a flag planted in the earth within a border to mark a country.
For コク, imagine a country shaped like a giant coke bottle: coke -> コク, and the border encloses the land.