zhniúr
1. refers to the person who presided over the group meeting. When the ancient princes joined the League, they cut off the cow's ears to hold blood, and put them on a bead plate, which was presided over by the League, so that the participants could wipe blood on their mouths to show their sincerity.
2. Later generations take the lead in a certain aspect by calling people.
If used as an adjective, it means that someone is a leader in a certain field.