What is "The Sign of the Cross"? Shocking!

What is, "The Sign of the Cross"?
Is it Scriptural, and or not, where did it originate from?
If this subject matter is of interest to you feel free to watch, and feel free to critique the material in a Berean (Acts 17: 11) approach of course.
HalaluYAH, meaning praise YAH, as per Tehillim / Ps. 68: 4 etc........,
All praise and esteem to the Sovereign of the ages, to the Almighy YaHUaH, our Father of Lights, who alone is wise, be respect and esteem forever and ever.
(1 Timothy 1: 17)
May the peace of the Almighty YaHUaH, which surpasses all understanding, guard your heart, and mind through Messiah YaHUsHua.
(Philippians 4: 7)
Have a YAHsome day!
Tehillim / Ps. 47: 2
For YaHUaH Most High is AWEsome; A great Sovereign over all the earth.

Видео What is "The Sign of the Cross"? Shocking! канала Mikal Shabbat Scriptural Studies