A paten, or diskos, is a small plate, usually made of silver or gold, used to hold Eucharistic bread which is to be consecrated during the Mass. It is generally used during the liturgy itself, while the reserved sacrament are stored in the tabernacle in a ciborium.

Paten, 13th century, now part of the Metropolitan Museum of Art Ensemble for the celebration of the Eucharist
Derrynaflan Paten, part of an 8th- or 9th-century communion set found in County Tipperary, Ireland