This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development is uncertain. The modern form combines 金 (metal) with 矢 (arrow), but the original purpose and meaning are unclear.
The kanji visually combines metal 金 and arrow 矢, but its meaning is uncertain. Treat it as a rare character with no clear standalone meaning.
For シ, imagine a shiny metal arrow: the 'shi' sound in 'shiny' cues シ, while the metal arrow shape reminds you of the kanji.