The noun metal
(mǎssēḵāh) is derived from the verb which means to pour into a cast.
It is the same term that was used of the golden calf at Sinai (Exodus 32:4, Exodus 32:8). The same terminology is also used of the calves that Jeroboam sets up in Dan and Bethel (1 Kings 14:9).
4 Do not turn to idols or make for yourselves any gods of cast metal: I am the LORD your God.