1. The OU (Orthodox union) Kosher is the world’s largest and most widely recognized international kosher certification agency, certifying over 1,000,000 products produced in more than 13,000 plants located in 105 countries around the world. 2. The OU symbol is one of the world’s best-known trademarks. 3. High quality food standard assurance. 4. Highest standards of kosher certification.