[header] How to buy kosher food [title] Look for the ou label. [step] The ou label, which looks like a u within a o-shaped circle, is one of the most common kosher certification labels in the united states and abroad. Ou stands for the union of orthodox jewish congregations of america, commonly known as the orthodox union. 
The ou label can only be put on kosher foods if those foods receive written permission from the orthodox union kosher division. [substeps] The ou label has a separate kosher for passover certification, which is published in their annual kosher directory passover edition.