For Vehicles:

* Headlights: These are the most obvious example. They use reflectors to direct the light beam forward, making the vehicle visible to oncoming traffic.

* Taillights: Similar to headlights, taillights use reflectors to direct the light beam backward, making the vehicle visible to drivers behind.

* Side reflectors: These are small, often triangular reflectors placed on the sides of vehicles, making them more visible from the side.

* License plate reflectors: These are required in many places to increase the visibility of the license plate at night.

* Hazard lights: These are flashing lights that are activated in emergency situations to warn other drivers.

For Pedestrians and Cyclists:

* Reflective clothing: Jackets, vests, and other clothing items with reflective strips help make pedestrians and cyclists more visible at night.

* Reflective bike lights: These are small lights that attach to the front, back, or sides of bicycles, making them more visible to other vehicles.

* Reflective strips: These are thin strips of reflective material that can be attached to clothing, backpacks, and other items.

* Reflective tape: This is a wider, more durable form of reflective material often used on bike helmets, backpacks, and luggage.

Other:

* Road signs: Many road signs incorporate reflective materials to improve visibility at night.

* Safety cones: These often include reflective stripes to make them more visible in low-light conditions.

* Emergency flares: These contain a pyrotechnic compound that produces a bright, reflective flame.

* Life jackets: Some life jackets include reflective strips to make the wearer more visible in the water.

The principle behind these safety devices is simple: they reflect light back towards its source, making the object more visible to others. This is especially important in low-light conditions when it's more difficult to see objects.