
der Anrufer
caller
A person who makes a telephone call.
Ein unbekannter Anrufer hat sich nach Ihnen erkundigt.
An unknown caller asked about you.
caller / appellant
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caller
A person who makes a telephone call.
Ein unbekannter Anrufer hat sich nach Ihnen erkundigt.
An unknown caller asked about you.

appellant
In the legal sense, a person who appeals to a court or higher authority to have a decision reviewed.
Der Anrufer des Verwaltungsgerichts legte Beschwerde gegen den Bescheid ein.
The appellant to the administrative court filed an objection against the decision.
'Der Anrufer' (the caller/appellant) is derived from the verb 'anrufen' (to call; to appeal to). The ending '-er' indicates a male person who performs the action. The female form is 'die Anruferin' (the female caller/appellant).
Die Anruferin wollte mit der Chefin sprechen.
The female caller wanted to speak with the boss.
In the context of phone calls, 'Anrufer' (caller) is often combined with adjectives like 'unbekannt' (unknown), 'anonym' (anonymous), or 'der erste/nächste' (the first/next). 'Die Nummer des Anrufers' (the caller's number) is also a common phrase.
Die Nummer des Anrufers wurde auf dem Display nicht angezeigt.
The caller's number was not shown on the display.
This meaning belongs to the technical language of the justice system. You can recognize it because the context is always a court, an authority, or a formal proceeding. Words like 'Gericht' (court), 'Beschwerde' (complaint/appeal), or 'Verfahren' (proceeding) are clear signals.
Das Gericht gab dem Anrufer in seinem Urteil recht.
The court found in favor of the appellant in its judgment.