🦺救生衣A safety vest. Means construction, safety and high visibility. Use it for work zones and safety-first talk.
🥬绿叶蔬菜A leafy green. Means greens, salads and healthy eating. Use it for diet posts and vegetarian meals.
🥼白大褂A lab coat. Means science, medicine and experiments. Use it for research, doctors and "back to the lab". Alternative: 🧪 (test tube), 🔬 (microscope).