Are there any special markers or signs in the technologies used that indicate their special properties or state?

In Android, there are special markers and indicators that denote specific properties of components or their state. For example:

• Tags — string labels that can be assigned to a View for identification or storing additional information.
• State attributes — such as isSelected, isActivated, isEnabled on a View, which reflect the current state of the interface element.
• Manifest tags — like android:exported, indicating whether the component is accessible from other applications.
• Annotations — such as @Deprecated, @Nullable, which provide information about code properties.
• Flags and labels in Intent — for example, FLAG_ACTIVITY_NEW_TASK, which influence the behavior of activity launches.

These markers help the system and developers manage component behavior and monitor their state.