long spear
錟 centers on a long spear, a weapon with a metal head and a long shaft.
錟 combines 金 (metal) with 炎, which likely contributes the sound. The character is used for a long spear, a metal weapon.
The left side is metal 金, and the right side is flames 炎. Picture a long spear with a metal tip that glows like fire as it strikes.
For タン, imagine a long spear with a metal tip that makes a sharp 'tan' sound when it hits a target: tan -> タン.
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