Signing the cross
Ritual gesture whereby one places right hand on forehead, center of chest, left shoulder and right shoulder.
See Gesture, Posture and Movement for a detailed description.
This is done at multiple times during the mass:
At the Salutation - X "In the name of the Father, Son, & Holy Spirit".
At the Gloria - "with the Holy Ghost art most X high ..."
At the Gospel - X "The Holy Gospel . . ."
At the Creed - "I look for X the Resurrection"
At the Benedictus - X"Blessed is he that cometh.."