Elevation of the Host
The ceremony in the Mass according to the Roman Rite wherein, immediately after the Consecration of the Host, the celebrant raises It high enough to be seen and adored by the congregation.
The most ancient mention of the Elevation is found in the synodal statutes of Eudes de Sully, Bishop of Paris (1196-1208), who introduced this practise, to protest against the erroneous opinion that the change of the bread into the Body of Christ was complete only after the Consecration of the chalice.
There is a like Elevation of the chalice, which is first mentioned in the Ordo Romanus XIV (1311), the papal ceremonial of Pope Clement V.
A bell is rung at each Elevation to call the attention of the faithful.
Pius X granted an indulgence of seven years and seven quarantines (40 days) to all who look with piety, faith, and love upon the elevated Species.
New Catholic Dictionary