aspergillum

thumb|A Western-style aspergillum thumb|Aspergillum in a silver aspersorium or situla

An aspergillum ("little sprinkler", less commonly, aspergilium, aspergil or asperger) is a Christian liturgical implement used to sprinkle holy water. It comes in three forms: a freshly cut hyssop branch, a brush-like bundle that is dipped in the holy water and shaken, and a perforated, mace-like metal ball with a handle. Some have sponges or internal reservoirs that dispense holy water when shaken, while others must periodically be dipped in an aspersorium (holy water bucket, known to art historians as a situla).