Acerra (incense box)
In Ancient Roman sacrificial tradition, an acerra was the incense box used in sacrifices. The incense was taken out of the acerra and let fall upon the burning altar; hence, we have the expression de acerra libare.
The acerra was also, according to Festus, a small altar, placed before the dead, on which perfumes were burnt. There was a law in the Twelve Tables, which restricted the use of acerrae at funerals.