Which tool can be used for both protection and signaling?

Light wands serve a dual purpose of protection and signaling, making them a versatile tool in various environments. They are primarily designed for signaling, often used in traffic control or during emergencies to direct attention or convey important messages visually. The bright, noticeable light emitted by these wands can catch the eye from a distance, making them effective in both day and nighttime conditions.

Additionally, light wands can offer some protection, particularly when they are constructed from durable materials that can withstand exposure to harsh conditions. While their primary function might lean towards signaling, they can also be part of a safety gear ensemble that ensures visibility and alerts others to your presence or actions, thus contributing to overall safety in specific scenarios.

In contrast, while full-face shields and goggles provide excellent protection for the eyes and face, they don’t serve the signaling function. A Marline spike is primarily a tool used in rope work and has no protective or signaling capabilities. This distinction clarifies why light wands are the most suitable answer for this particular question.