---
title: "Kosher certification (OU and others) — what it means"
description: "A certifying agency attests that the product is kosher, often with a letter alongside for the category. What the symbol looks like, what happens if you ignore it, an"
url: https://atoneplace.net/symbol/cert-kosher-ou/
site: "At One Place"
---

# Kosher certification (OU and others)

**Kosher certification (OU and others): A certifying agency attests that the product is kosher, often with a letter alongside for the category.**

## What it looks like

A letter U inside a circle for the Orthodox Union, a K inside a star, a K inside a circle, or one of dozens of other agency marks.

## What it means

Certification is agency-specific rather than universal — OU, OK, Star-K, KOF-K and many regional bodies each own their own mark, and the suffixes carry the detail: D for dairy, DE for equipment that also processes dairy, P for kosher for Passover, and Pareve for neither meat nor dairy. The important exception is a plain letter K on its own, which no one owns and which any manufacturer may print without oversight, so it is not evidence of certification by anybody.

> Defined by Private certification agencies. Where a symbol differs between standards, the difference is described above rather than resolved — both versions are in circulation on real labels.

## Other certification marks symbols

| Symbol | Means |
| --- | --- |
| Energy Star | The product meets US Environmental Protection Agency efficiency criteria for its category. |
| Fairtrade Mark | The certified ingredients were bought on Fairtrade terms, including a minimum price and a premium paid to the producer organisation. |
| OEKO-TEX Standard 100 | Every component of the textile was tested for harmful substances and passed. |
| Woolmark | The product is made from pure new wool and meets the Woolmark performance specifications. |
| NSF certification | Tested and certified by NSF against a public health or food equipment standard. |
| BSI Kitemark | BSI has tested the product and audits the factory that makes it. |
| GS mark (Geprüfte Sicherheit) | Tested safety — a German voluntary mark requiring independent testing and factory surveillance. |
| Halal certification | A certifying body attests that the product complies with Islamic dietary rules. |
| USDA Organic seal | At least 95% of the ingredients are certified organic under the US National Organic Program. |
| EU organic leaf | At least 95% of the agricultural ingredients are organic under EU rules. |
| Crossed grain (certified gluten free) | Independently certified to contain no more than 20 parts per million of gluten. |
| Vegan Society sunflower | Registered with the Vegan Society: no animal ingredients and no animal testing at any stage. |
| Leaping Bunny | Certified cruelty free: no animal testing by the company, its suppliers or third parties after a fixed cut-off date. |

## Common questions

### What does the kosher certification (ou and others) symbol mean?

A certifying agency attests that the product is kosher, often with a letter alongside for the category.

### What does it look like?

A letter U inside a circle for the Orthodox Union, a K inside a star, a K inside a circle, or one of dozens of other agency marks.

## Related pages

- [Halal certification](https://atoneplace.net/symbol/cert-halal/)
- [Vegetarian mark (India)](https://atoneplace.net/symbol/food-veg-india/)
- [Energy Star](https://atoneplace.net/symbol/cert-energy-star/)
- [Fairtrade Mark](https://atoneplace.net/symbol/cert-fairtrade/)
- [OEKO-TEX Standard 100](https://atoneplace.net/symbol/cert-oeko-tex/)
- [Woolmark](https://atoneplace.net/symbol/cert-woolmark/)
- [NSF certification](https://atoneplace.net/symbol/cert-nsf/)
- [BSI Kitemark](https://atoneplace.net/symbol/cert-kitemark/)
- [GS mark (Geprüfte Sicherheit)](https://atoneplace.net/symbol/cert-gs/)
- [Halal certification](https://atoneplace.net/symbol/cert-halal/)
- [USDA Organic seal](https://atoneplace.net/symbol/cert-usda-organic/)
- [EU organic leaf](https://atoneplace.net/symbol/cert-eu-organic/)

## Sources

- Official vendor product documentation — At One Place (/about/)