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Sometimes the signal is directed toward a particular person.
In other political systems, heirs can also exist informally:
Political successors
Military commanders
Dynastic family members
Many governments—even those that claim to be purely institutional—experience periods when power transitions revolve around individuals.
One way to do that is through demonstrations of strength.
When a new leader emerges, other states often ask:
Will the new leader maintain previous policies?
Are they experienced or inexperienced?
Can they control their military?