Catholic priests and believers make the sign of the cross, signum crucis, to signify faith in Christ and the Holy Trinity. A large cross is made by touching some or all of one's fingers successively to forehead, chest, left shoulder and right shoulder. Smaller crosses can be made by touching forehead, lips, and chest, or in the air facing away from the signer. The action is typically paired with silent or spoken recitation of the words “In the name of the Father and of the Son and of the Holy Spirit."

JH 2018

Mosaic of Christ making the sign of the cross, in the Byzantine basilica of Sant'Apollonare Nuovo in Ravenna. Source: Wikimedia Commons.