Still used today, in Ancient Rome this instrument called the faithful to worship in the temples
The main room (cella) inside a temple housed the cult 
image of the deity to... [DOC] [TLE] Lumen gentium - La Santa Sede [PAR] Since the Church is in Christ like a sacrament or as a sign and instrument both of 
a very ... (12) The Spirit dwells in the Church and in the hearts of the faithful, as in 
a temple.