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The metre (international spelling) or meter (American spelling) (from the Greek noun μέτρον, "measure") is the base unit of length in the International System of Units (SI). The SI unit symbol is m. The metre is defined as the length of the path travelled by light in a vacuum in 1/299 792 458 seconds.
Zettameter is an SI device for measuring distance. It is equal to 1021 meters. The symbol for zettameter is Zm.