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App bar
Top bar of a mobile app showing title and key actions.
An app bar is the strip across the top of a mobile screen that shows the screen title, a back arrow on the left, and one or two action icons on the right (search, more, settings).
Keep it short and stable — users learn to look there for navigation. iOS and Android handle app bars slightly differently (iOS centers the title; Material left-aligns it), so respect platform conventions when relevant.