Unit Definition (yoctometer) The yoctometre (or yoctometer), symbol: ym, is a decimal fraction of a metre, from the International System of Units. One yoctometre is 1x10-24 (1e-24) in scientific notation. Very small!
Unit Definition (quarter [print]) The quarter is a unit of distance equal to 0.25 millimeter. See Q and point.
Length/Distance 
