Pia batismal

Baptismal font, Igreja do Castelo.
The seashell, especially the scallop, is the symbol of baptism in Christianity.
Saint Ambrose wrote that fonts and baptisteries were octagonal "because on the eighth day, by rising, Christ loosens the bondage of death and receives the dead from their graves.
The symbols of baptism are :
Water. Water is the primary symbol of baptism ;
Oil. Oil is also a symbol of baptism, and two kinds are used. ...
Baptismal garment. The baptismal garment is a white garment either worn from the beginning of the ritual or given after pouring or immersion. ...
Candle. ...
Dove. ...
Flame. ...
Baptismal font. ...
Seashell.