country
圀 centers on the concept of a country or nation. It is a variant form of 国, carrying the same core meaning of a bounded political territory.
圀 is a variant form of 国, created during the reign of Empress Wu Zetian in China. It replaces the inner 玉 with 方 and 儿, possibly to symbolize the eight directions (八方) within a country's borders.
The outer enclosure 囗 represents borders, and inside we see 方 (direction) and 儿 (legs, suggesting people). Imagine a country as a bordered land where people move in all directions.
For コク, think of a country as a solid block of land: 'block' sounds like コク, and the enclosure 囗 reinforces the idea of a bounded block.