'Heads' in the Bible

Then, looking up to the window, he said, Who is on my side, who? and two or three unsexed servants put out their heads.

Then he sent them a second letter, saying, If you are on my side, and if you will do my orders, come to me at Jezreel by this time tomorrow, with the heads of your master's sons. Now the king's seventy sons were with the great men of the town, who had the care of them.

And when the letter came to them, they took the king's sons and put them to death, all the seventy, and put their heads in baskets and sent them to him at Jezreel.

And a man came and said to him, They have come with the heads of the king's sons. And he said, Put them down in two masses at the doorway of the town till the morning.