spear
鏦 centers on a spear, a pointed weapon used for thrusting or throwing.
鏦 combines 金 (metal) with 從, which likely contributes the sound. The character denotes a metal spear.
The left side 金 (metal) and the right side 從 (which looks like a person following) suggest a metal weapon that follows the hand: a spear.
For ショウ, imagine a show of spear-wielding warriors: show -> ショウ, and the metal spear gleams on stage.