This character 缶 is rarely used in Chinese. The meaning of this radical is borrowed from Japanese: 缶 (=かん) = box. It is understood as a pestle 午 in a mortar 凵. As the pestle 午 in the mortar is vertical, it has the meaning “noon” [wǔ], as the sun is then also vertical.
“Noon” can be understood as a pestle 午 that is used in a mortar 凵. (compare: ceramic 缶 [fǒu]) As the pestle 午 is vertical in the mortar, the meaning of “noon” arises because the sun is then also vertical.
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and can opener 十 of that can 凵)
