Cadency
In heraldry , cadency is any systematic way to distinguish arms displayed by descendants of the holder of a coat of arms when those family members have not been granted arms in their own right . 
<triplet> heraldry <subj> arms <obj> studies <subj> coat of arms <obj> studies <triplet> arms <subj> heraldry <obj> studied by <triplet> coat of arms <subj> heraldry <obj> studied by