No one under eighteen

☣ biohazard ⚠ warning ⚠️ warning ☢️ radioactive 📵 no mobile phones ☣️ biohazard ☢ radioactive 🚳 no bicycles 🚭 no smoking 🚫 prohibited 🚯 no littering 🚸 children crossing ⛔ no entry 🚱 non-potable water 🚷 no pedestrians