App Interface Guideline: Accessibility — Icon Button Labels. Keywords: icon button accessibilityLabel. Platform: iOS/Android/React Native. Description: Icon-only buttons must expose an accessible label. Do: Set accessibilityLabel or label prop on icon buttons. Don't: Icon buttons without accessible names. Good Example: <Pressable accessibilityLabel="Close"><XIcon /></Pressable>. Bad Example: <Pressable><XIcon /></Pressable>. Severity: Critical.