That’s *Reflective Hazard Warning Tape* - the yellow/black diagonal stripe kind.
1. *Mark hazards + danger zones* - Stick it on walls, pillars, stairs, machine edges, forklift paths, low beams. The diagonal stripes scream "Caution, watch out".
2. *Visibility at night* - It’s reflective. When headlights or torchlight hit it, it glows. Big deal for construction sites, warehouses, parking lots, roadsides.
3. *Floor marking* - Outline restricted areas, walkways, fire exits, or where not to step. Keeps workers/trucks from accidents.
4. *Vehicle marking* - Trucks, trailers, containers, equipment. Makes them visible to other drivers at night.