How does Unity signify a GameObject that has a trigger collider?

A GameObject with a trigger collider is signified by marking it explicitly in the inspector. In Unity, when working with colliders, you have the option to designate a collider as a trigger. This is done by checking the “Is Trigger” box in the collider component within the inspector panel.

This feature allows the collider to participate in trigger interactions rather than physical collisions, meaning it can detect when other GameObjects enter, exit, or stay within its bounds without applying a physical response like bouncing or stopping. This is particularly useful in scenarios such as areas that activate events or zones that detect player entry without affecting movement.

Color changes, attaching a Rigidbody component, or naming conventions in the Hierarchy window do not inherently indicate that a GameObject is set as a trigger. The trigger status is specific to the collider component's settings, making the explicit marking in the inspector the definitive method for identification.