'Heads' in the Bible

I will turn your festivals into mourning, and all of your songs to dirges. I will cause all of you to put on sackcloth and to shave all of your heads. I will make that time like mourning for an only son, and its conclusion will be like the end of a bitter day."

I saw the Lord standing beside the altar as he was saying, "Strike the doorposts so that the thresholds tremble, bringing them down on the heads of all of them. Those who survive I will kill with the sword. Those who flee will not escape. There will be no deliverance for the fugitives.