Based on the search results, "5R" refers to the 5 Rs of waste management, which are Refuse, Reduce, Reuse, Repurpose, and Recycle. These are a set of principles that businesses and individuals can follow to reduce the amount of waste they generate and promote sustainability. The 5 Rs hierarchy suggests that recycling should be treated as a last resort after attempting to refuse, reduce, reuse, or repurpose waste. By following these principles, individuals and businesses can help conserve natural resources, reduce pollution, save energy, and reduce waste to landfills.