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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.
A teaspoon is an item of cutlery, a measuring instrument, of approximately 5ml, or a unit of measurement of volume (usually abbreviated tsp.).