De settameter (symboal Zm, Fryske ôfkoarting Sm) is in lingte-ienheid, gelyk oan 1.000.000.000.000.000.000.000 meter. De namme is gearstald út de SI-ienheid foar langte, "meter", en it SI-foarheaksel setta. Om't de ynternasjonale ferzje hjirfan "zetta" is, is de ynternasjonale ôfkoarting Zm. In settameter is 1000 eksameter of 0,001 jottameter.
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