In the context of rolling a joint, the term "rolling tip" usually refers to the filter or crutch that is added to one end of the joint. It serves multiple purposes:

1. Stability: The rolling tip adds structure and stability to the joint, making it easier to hold and smoke.

2. Prevents Burns: It helps prevent burns to your fingers and lips by providing a barrier between the burning end of the joint and your skin.

3. Improves Draw: A well-constructed rolling tip can improve the airflow (draw) through the joint, making it easier to smoke.

4. Keeps Dry Herb Place: The rolling tip acts as a stopper, preventing the contents of the joint from falling out during smoking.