Samarium (element)
釤 is a rare kanji that refers to the chemical element samarium. It has no broader conceptual center beyond this specific scientific use.
釤 is a modern coinage for the element samarium, combining the metal radical 金 with the phonetic component 彡 (サン). The exact historical development is uncertain, but it follows the typical pattern of chemical element kanji.
The left side 金 (metal) tells you it's a metallic element, and the right side 彡 (サン) hints at the reading. Together they point to the rare metal samarium.
For サン, picture a scientist named Sam who works with the metal samarium: Sam -> サン, and the metal radical 金 reminds you it's an element.