A yoctometre (American spelling: yoctometer, symbol: ym) is an SI measure of length that is equal to 10-24 (yocto) of a metre. A yoctometer is equivalent to 1/100 of the diameter of an electron, and 1/100 000 the diameter of a proton or neutron.
In terms of relative length of units, a yoctometre ranks as follows: Planck length << yoctometre << zeptometre. A yoctometre is 1/1000 of a zeptometre (1 zeptometre (zm) = 1,000 yoctometres).
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