The Collaborative International Dictionary
Nehushtan
Nehushtan \Ne*hush"tan\, n. [Heb.]
A thing of brass; -- the name under which the Israelites
worshiped the brazen serpent made by Moses.
--2 Kings xviii.
4.
Wikipedia
Nehushtan
In the biblical Book of Numbers, the Nehushtan (or Nohestan) ( Hebrew: נחושתן or נחש הנחושת) was a bronze serpent on a pole which God told Moses to erect to protect the Israelites who saw it from dying from the bites of the "fiery serpents" which God had sent to punish them for speaking against God and Moses.
King Hezekiah later instituted a religious iconoclastic reform and destroyed "the brazen serpent that Moses had made; for unto those days the children of Israel did burn incense to it; [it was called|and he called it] Nehushtan".