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A teaspoon is an item of cutlery, a measuring instrument, of approximately 5ml, or a unit of measurement of volume (usually abbreviated tsp.).
The cubic decametre (in British English and international spelling as used by the International Bureau of Weights and Measures) or cubic decameter (in American English) is the unit of volume. Its SI symbol is dam3. It is the volume of a cube with edges one decametre in length.