bratr
Bratr is a term that can refer to a few different things, depending on the context and language. In several Slavic languages, including Czech and Slovak, "bratr" is the word for "brother." This can refer to a male sibling, a close male friend, or even a member of a religious order, similar to the English word "brother."
In a historical context, "bratr" is famously associated with the Bohemian Brethren, also known as the Unity
More recently, "Bratr" has also been used as a title or designation for individuals within certain organizations