For Head Of State we have a term and definition in Political.

In a presidential system, the head of state is the president himself, who is considered to be the symbolic embodiment of the nation. In parliamentary systems, the head of state is not the prime minister but a figure considered to be above politics and representing the nation as a whole. In these systems the head of state may have mainly a ceremonial function, as in present-day Germany and Israel. In a constitutional monarchy, the king or queen is the head of state-their real power may be limited but their symbolic power may be great.
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