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A span is the distance measured by a human hand, from the tip of the thumb to the tip of the little finger. In ancient times, a span was considered to be half a cubit. Sometimes the distinction is made between the great span (thumb to little finger) and little span (index finger to little finger).
Zettameter is an SI device for measuring distance. It is equal to 1021 meters. The symbol for zettameter is Zm.