YOD-VAV-HEH-HEH
I think the hebrew letters of the Sign of the Cross are the Name and also the relationship the Most Holy Trinity has with each other. YOD ( touching the forehead) is God the Father and the seminal power of Creation. Vav (touching of your heart) is the meeting or combining of Heaven and Earth ( the Son) and the Heh (x2) of each shoulder is the respiration or breath of the relationship between the Father and the Son, the Love emanating from each one perpetually, hence Heh Heh( the literal sound of breath of the Holy Ghost)as the Uncreated breath of life. Three Divine Dersons, 4 Divine Relationships.
Getting any deeper gets into the perversions of gematria et al and I don't go there.
Thinking of this makes me less flippant and casual when signing myself