Holy Weapon: Aspergillum
as·per·gil·lum. noun: a brush or instrument for sprinkling holy water
Morning star: A weapon consisting of a heavy ball set with spikes, attached to a staff and NOT suspended from one by a chain. The Morning star is a rigid weapon, sometimes called a holy water sprinkler.
Every cleric should have one of these, with extra vials of holy water...just in case.