# What does OSS mean in BJJ?

Oss (or osu) is a Japanese expression used in martial arts to show respect, acknowledgment, or greeting. In BJJ, it is used to say hello, thank you, or acknowledge instructions. Some gyms use it constantly; others rarely. It is not required but is part of BJJ culture at many academies.

**[Read full answer on BJJ Notes](https://www.bjjnotes.app/knowledge-base/what-does-oss-mean-in-bjj)**

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**Tags:** etiquette

**Source:** [BJJ Notes Knowledge Base](https://www.bjjnotes.app/knowledge-base/what-does-oss-mean-in-bjj)