Ostension (Christianity)
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In Christianity, ostension is a solemn display of sacred objects and relics for adoration.[1]

Often a special vessel, called monstrance or ostensorium, is used for display of objects of piety on an altar or as a reliquary. The tradition of ostension of the Blessed Sacrament is traced to at least 12th century, before the introduction of special ostensoria.[2]