Cadency n. : Descent of related families; distinction between the members of a family according to their ages.

Example:
Do marks of Cadency in heraldry (such as the mullet) only apply to men?

Taxonomy
Arms, label, mark of cadency, England, Scotland, daughter, Heraldry, coat, coat of arms, The Royal Family, generation, eldest son, second son, family, English system, College of Arms, fifth son, white label.

Defination from the web:
cadency is any systematic way of distinguishing similar coats of arms belonging to members of the same family. Cadency is necessary in heraldic systems in which a given design may be owned by only one person (or, in some cases, one man) at once. ...