angezeigt
indicated
Advisable, appropriate, or necessary in a particular situation.
Bei diesen Symptomen ist ein sofortiger Arztbesuch angezeigt.
With these symptoms, an immediate visit to the doctor is indicated.

indicated / displayed / reported
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indicated
Advisable, appropriate, or necessary in a particular situation.
Bei diesen Symptomen ist ein sofortiger Arztbesuch angezeigt.
With these symptoms, an immediate visit to the doctor is indicated.

'Angezeigt' (indicated/displayed/reported) is the past participle of the separable verb 'anzeigen' (to report; to display). The different meanings of the adjective derive directly from the meanings of the verb: 'etwas anzeigen' (to report something), 'etwas anzeigen' (to display something), or that 'etwas angezeigt ist' (something is advisable/indicated).
Der Computer zeigt eine Fehlermeldung an.
The computer displays an error message.
You can recognize the meaning from the context. If it is about advice or necessity, it means 'ratsam' (advisable). If it is about technology or data, it means 'dargestellt' (displayed). If it is about the police or law, it means 'gemeldet' (reported).
Bei dem Wetter ist warme Kleidung angezeigt.
In this weather, warm clothing is indicated.
In the meaning 'ratsam' (advisable) or 'erforderlich' (necessary), 'angezeigt' (indicated) almost always stands at the end of a sentence together with the verb 'sein' (to be). A typical construction is also 'Es ist angezeigt, etwas zu tun' (It is indicated/advisable to do something).
In dieser Situation ist Geduld angezeigt.
In this situation, patience is indicated.
When 'angezeigt' (displayed) has the meaning 'dargestellt' (displayed/shown), it often stands before nouns that refer to information. Typical examples are 'die angezeigte Temperatur' (the displayed temperature), 'der angezeigte Name' (the displayed name), or 'die angezeigte Route' (the displayed route).
Bitte geben Sie die auf dem Bildschirm angezeigte Nummer ein.
Please enter the number displayed on the screen.
necessary
'notwendig' and 'angezeigt' can both mean that something is sensible or required in a situation. 'notwendig' is general and direct: something is needed. 'angezeigt' sounds more formal and more cautious. It often means that a certain response or measure is appropriate or advisable under the circumstances. It is used, for example, in health contexts, counseling, or official assessments. In normal everyday language, 'notwendig' is usually more natural. 'angezeigt' fits when you want to say objectively which measure is now appropriate.

Nach den neuen Beschwerden war ein Besuch bei der Ärztin angezeigt.
After the new symptoms appeared, a visit to the doctor was indicated.
Bei der Wanderung morgen ist warme Kleidung notwendig.
Warm clothing is necessary for the hike tomorrow.