PAX

Pax (?), n. [[L. pax peace. See Peace.]] 1. 1. (Eccl.) The kiss of peace; also, the embrace in the sanctuary now substituted for it at High Mass in Roman Catholic churches.
2. 2. (R. C. Ch.) A tablet or board, on which is a representation of Christ, of the Virgin Mary, or of some saint and which, in the Mass, was kissed by the priest and then by the people, in mediæval times; an osculatory. It is still used in communities, confraternities, etc.
Kiss the pax, and be quiet like your neighbors. Chapman.