What does Ezekiel 9:2 mean?

Six men came from the direction of the upper gate that faces north, each carrying a deadly weapon. With them was a man dressed in linen, carrying a writing kit. They came in and stood beside the bronze altar. Ezekiel 9:2 - Modern Text Bible

(Six figures with weapons and one with a writing kit appear, symbolizing judgment and record-keeping. They stand at the altar, the place of sacrifice.)