B20 can refer to two different things:
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Business 20 (B20): An event that is part of the G20 Summit, which aims to express common views from the international business community. The main purpose of the B20 is to develop recommendations and issue relevant commitments from business leaders and organizations to address current issues.
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Biodiesel Blend (B20): A common blend of biodiesel and petroleum diesel, consisting of 20% biodiesel and 80% diesel. B20 is popular because it offers a good balance of cost, emissions, cold-weather performance, and compatibility with conventional engines.
