Genuflexion (the bending of the knee) is a natural sign of adoration or
reverence. It is frequently used in the ritual of the Church. Thus the faithful
genuflect in passing before the tabernacle where the Blessed Sacrament is
reserved; the priest repeatedly genuflects at Mass in adoration of the
Eucharist. The double genuflection is still required in some countries before
the exposed Blessed Sacrament. Those who make it kneel briefly on both knees and
incline the head reverently, hands joined together palm to palm with the right
thumb crossed over the left, and held at the breast.