What is the term used for a pilot balloon in parachuting?

The term "Pi-Ball" refers specifically to the pilot balloon in parachuting. A pilot balloon is a small, helium-filled balloon that is released to help determine the wind speed and direction at various altitudes before a jump. This information is crucial for jumpmasters and parachutists to calculate the appropriate jump point and ensure a safe and accurate landing.

Using a Pi-Ball allows jumpers to observe the balloon's ascent and behavior in the atmosphere, providing valuable data that assists in establishing patterns of wind movement. This practice enhances safety during jumps and improves landing accuracy, making it an essential tool in parachuting operations.

Understanding the function and importance of the Pi-Ball in the context of parachute jumping underscores why it is the correct answer in this scenario, as it uniquely identifies the tool specifically associated with pre-jump wind assessment.