Phosphonium (element), phosphorus
鏻 centers on the chemical element phosphorus, particularly in its phosphonium form. It is a specialized scientific character with no common everyday meanings.
鏻 is a modern coinage combining 金 (metal) with 粦 (a phonetic component associated with phosphorus-related characters). It was created to represent phosphonium, a metallic-like ion.
The left side 金 (metal) suggests a metallic substance, while the right side 粦 appears in other phosphorus-related characters. Together they point to a phosphorus compound: phosphonium.
For リン, think of the English word 'phosphorus' and focus on the 'phorus' part, which sounds like 'for us' — but here, imagine a ring made of phosphorus: ring -> リン.