Gallows

A wooden structure, sometimes a tree, used to impale or display a body after death, or for execution by hanging. Those hanged on gallows were deemed to be under God's curse.

A gallows used for impalement and display of bodies

Ezra 6:11 See also Joshua 8:29, Joshua 10:26; 2 Samuel 4:12

I also decree that if any man interferes with this directive, a beam is to be torn from his house and raised up, and he is to be impaled on it. And his own house shall be made a pile of rubble for this offense.

A gallows used for execution

Esther 7:9–10 See also Esther 2:23, Esther 9:13

Then Harbonah, one of the eunuchs attending the king, said: “There is a gallows fifty cubits high at Haman’s house. He had it built for Mordecai, who gave the report that saved the king.” “Hang him on it!” declared the king. So they hanged Haman on the gallows he had prepared for Mordecai. Then the fury of the king subsided.

Those hanged on gallows are under God's curse

Galatians 3:13 See also Deuteronomy 21:23

Christ redeemed us from the curse of the law by becoming a curse for us. For it is written: “Cursed is everyone who is hung on a tree.”