Unit Definition (zettameter) The zettametre (or zettameter), symbol: Zm, is an SI metric unit of length. 1 zettametre is equal to 1e+21 metres, a very large distance. Not to be confused with a zeptometre.
Unit Definition (fod) The fod is the traditional Danish foot, equal to about 12.365 inches or 31.41 centimeters.
Length/Distance 
