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The attoliter or attolitre is a common metric unit of volume. It is equal to 10-21 cubic meters. Plural name is attoliters.
Lambda (written λ, in lowercase) is a legitimate metric unit of volume equal to 10−9 m3, 1 cubic millimeter (mm3) or 1 microlitre (µL). Introduced by the BIPM in 1880, the lambda has been used in chemistry and in law for measuring volume, but its use is not recommended.