ammonium
銨 centers on ammonium, a chemical compound. The meaning is specific to chemistry and does not extend to broader concepts.
銨 is a modern character created for chemistry, combining 金 (metal) with 安 (peace/safety) to represent ammonium, likely chosen for its sound value アン.
The left side 金 (metal) and right side 安 (peace) come together to form ammonium, a compound often used in fertilizers that bring peaceful growth to crops.
For アン, picture an ammonium molecule shaped like the letter 'A' resting peacefully: A + 安 -> アン.