difference (n.) 9
[heraldry] variation, distinguishing mark [on a coat-of-arms]
Ham IV.v.184 [Ophelia, as she gives rue to a second person] you must wear your rue with a difference [i.e. differentiating one branch of a family from another]
MA I.i.64 [Beatrice to Leonato, of Benedick's wit] let him bear it for a difference between himself and his horse