The triangle represents recyclable and the number represents the material.
Number 1: The material is polyethylene terephthalate, which is commonly found in mineral water bottles and beverage bottles.
Number 2: The material is high-density polyethylene, which is commonly found in shopping bags and food bags.
Numbers 3 and 4: The material is polyvinyl chloride, low-density polyethylene, which is commonly found in plastic wrap.
Number 5: The material is polypropylene, which is commonly found in microwave lunch boxes and plastic water cups.
Number 6: The material is polystyrene, which is commonly found in disposable water cups.